Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8fba0bde1d990d…

MALICIOUS

PDF

101.5 KB Created: 2021-08-18 16:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 81a8b878a802c35eb191e1d0be64d545 SHA-1: 915a6e2563ca4aadde93d0e23510170eb57f5587 SHA-256: 2c8fba0bde1d990d8b71599d66279996f3d1df275c8017a035b08efc814bf7b3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=astro+a50+gen+4+update+firmware PDF link annotation
    • http://asbufestival.com/uploads/FCK_files/file/domexuvopubuduwovisipavex.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8ie7csm30ar0jt4r1hcleq2cr1/wilix.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160965129cfdd9---guruwolejopujojogil.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce8268674---kozalumogix.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e3af65239---nofejorixamuzivejuvejoto.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///vorepixapaz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/51597ba1aad348f6e4c150bf9af8f2d4/geredezolobo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/t7bbe0lnj2rqelr70m232kf5b6/jidirubifimapek.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/53811947659.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e90e19247---38454795257.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d1756d59b6a9d1f18da70a50259f4863/17200787414.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7ceea2b833d28681d3ce2170fe09b7e9/41076310111.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/girotituwafo.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/zabugokofid.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b1cd4aa05---jibatekukenefatigovadonu.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/xarujutovobisukugumuw.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609af59a7a4b1---getimujitatodenukev.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161177c346bdc6---36011584837.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075182270889---16209995690.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/zugepokakitu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161066117f308f---zodawomaba.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/fopuvubesa.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37c17256f---zogegineb.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/81892fd6a866f679af89ca0499a94a89/xuzeremetovizojudojipuw.pdfIn PDF document text
    • http://myqself.com/upload/files/50199648226.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/26759980716.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13979 19876 bytes
SHA-256: 7bf6c980f578724f156a335b5e65acd9c07f3ce851d29cb8d310a68f4b4e41a6
font_02_sfnt_off00016d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D04 11296 bytes
SHA-256: 6e6d4d6725b6e2fe5cb58ca85c6f8095ec518ad74e919e022274b76d300c3352

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