Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02416b0460700c7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 02:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 4d24039b51e27170f5e08fb990b7b931 SHA-1: bb1fbb7c03b395040884f55e3684f39e5806ec32 SHA-256: f02416b0460700c79f5dd81d9505c7dd6f087ac409f551fa21decb8a3e5f6246
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cructi.ru/uplcv?utm_term=a+pre+intermediate+english+reading+course+pdf PDF link annotation
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/ae9da0e8478d80588c3210c0f552fbc7/11087341470.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/84758182603.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/67559021320.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e5b605789---vilukoriwigokepitadino.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b489d7903a97abaf0e650a1876a05662/28354493184.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094089d80e51---80037703731.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/58a13c5f64ab696ab13e4c414c60d202/49625122565.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/q3kehmjm9qv3n64pk7qt0v2nad/rizotarututogag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0312e646---ludekujowitolosaxaw.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ac73953d80f---9313895337.pdfIn PDF document text
    • https://flyags.com/editorResources/file///86441450361.pdfIn PDF document text
    • http://charivne.info/images/file/kemavabilupexase.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/jifalinoweribirujobom.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/23522491422.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f66c4bbc6---gorapizik.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/35546822550.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/tawaparufuvejina.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/zijifewexugevutesug.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac83140638---10715616832.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/75846366392.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/bigijupodemuxolizok.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070b06b3a815---kafoxoguj.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/puxawelujujalow.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4c72ahqjtefn95vtamasri3cl2/wiwadakekipimop.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/om0dtbja5p1ap659bnqg82nn0v/48659110214.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB48 11148 bytes
SHA-256: 980d5d4aeb4ef1a82735332b2bebf0a9e4b051c75b0cc8e09b9183caee622a95
font_01_sfnt_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 15064 bytes
SHA-256: 57f23c77591e5682a9d83e946eebec25370b786f928b3e977fbc50f931841d38
font_02_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11305 18328 bytes
SHA-256: 4e05853cfe55ee67136d616966e038686c344c4f08fbc1e3135e721ec4a11c77

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