Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf8a91fc1420b4e…

MALICIOUS

PDF

95.6 KB Created: 2021-09-11 04:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98bc688dbb9cfe439617a7400af953ca SHA-1: 0f7a775653720e9c133052c85b0fcde60e4cf23a SHA-256: baf8a91fc1420b4e3bb69eef3f3e96caa1689d972e387055be773f9870fdd97a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of a 'Callback phishing phone lure' heuristic further suggests that the links may lead to phishing pages or facilitate fraudulent activities. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=josee+the+tiger+and+the+fish+full+movie+online PDF link annotation
    • http://egitara.com/upfiles/files/16837202867.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/xegulutoj.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vubexinemewezirisitufe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f69e924353---lorelufiwoxesirotol.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/japifawufobuluretevibiwos.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/tijofodijejurapekaf.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/jufakeselomuze.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbecf0ace---bozaxoza.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/94543717905.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f12e333de8ff8e49b735c995c7c012c8/66941115204.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/muwupujikuxi.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/woregakoxudiwurepu.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuzajijafe.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/giwitadajururudix.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d6b6698b---63930587643.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/xuxusopekipas.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/12281827918.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/9308309077.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/57541787013.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/dasifonivimelamokegaso.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/70513218222.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_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 10956 bytes
SHA-256: 66396f61fc58d10c0c0a304360f16e85396fa604f271b1b39bd45010d323fe0f
font_01_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 21680 bytes
SHA-256: e3ee6c942a55172b3c13c7109240415ec553f9c66eb94b026d4cef13aff98000
font_02_sfnt_off0001585d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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