Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6d06fe2faa7c09…

MALICIOUS

PDF

83.7 KB Created: 2021-10-11 10:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8cd073d65654cfecb229a68ead025ced SHA-1: befa63fccc0f0c9bbc9d48ec97aad05972885485 SHA-256: 4d6d06fe2faa7c09651392cbfb7c1605b8e1f35a0aeffcbede8fc18a4a20799f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_URGENCY_LURE' and 'SE_CALLBACK_LURE' indicate the document likely uses social engineering tactics to prompt user interaction, although the specific content is not readable due to truncation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=questions+short+answers PDF link annotation
    • http://tdvvietnam.vn/webroot/img/files/womarid.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/xawenadivovibokagirur.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gtejasl5ntlpoofdgoa4vbr7ce/5264621003.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/wegekomomusijegewup.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/sahuaqukbcv18629024dputqi9/luraxowididogagowej.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149151e42507---nevem.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/ketadinagab.pdfIn PDF document text
    • http://iccarrentals.com/files/file/7353195222.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/lasedaretir.pdfIn PDF document text
    • http://ossokahve.com/upload/file/33770112753.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/borixopuzutaruwezeni.pdfIn PDF document text
    • http://z500.si/files/xariwiwuxawamajududali.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210909135319.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///59722182598.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/38150275813.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/78893894862.pdfIn PDF document text
    • http://go-forum.cn/upload/files/direzixanasop.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa774975c---75327841340.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/96645035800.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/zekumebena.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d41d931c5c72db52187ee5d291df69f6/70086275110.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2955462632.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/46766204692.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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 10404 bytes
SHA-256: e291ad59d9ce1a91c3e756988c5601f478db66859672a70c86c213960c887c98
font_02_sfnt_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 18152 bytes
SHA-256: 14777e5e7b9911b7ee0929f5e75257574383470304e461876a13a2d7b957ca4d

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