Malicious PDF — malware analysis report

Static analysis result for SHA-256 95becbf368302775…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 06:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3e4eb2d242ced50b1a338812738fb675 SHA-1: 44d58307e1f278c89402ca21972b23dd00418231 SHA-256: 95becbf368302775f6f8f873169bfcba419181490bc41c370e19410bfeeecd31
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable or compromised domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure malicious destinations. While no scripts were explicitly extracted, the document's structure and embedded URLs strongly suggest it is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://www.kickcommerce.com/userfiles/file/numazifotob.pdf In PDF document text
    • http://ellev.fr/upload/files/40602607629.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/26824379548.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/70189780990.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210910135214.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109052246126030.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6fe38e22---34908942550.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/kodudona.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9b4b99e85d875d178c2a85a3bec8d57e/82707094302.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/91317218031.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd9f8ca5c---55097099876.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/xitivobomilewotike.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/95322866955.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/4782180540.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/889e2020ee1ff456b0434f6a2076ce06/winiwukegogapum.pdfIn PDF document text
    • https://olterus.net/contents/files/72419900645.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/rarewidepaj.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///38162456178.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/sigopuxobitokimanewoluluw.pdfIn PDF document text
    • http://orem.mn/uploads/files/65676753737.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/95996976702.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/45210379740.pdfIn PDF document text
    • http://beta-rc.com/upload/files/3769326585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=use+old+phone+as+security+cameraPDF link annotation
    • 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_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 17056 bytes
SHA-256: 6c1cb48af876caa7a215dc0dec0d84945e8e6f405379b4df2e3f5d642000e693
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 11000 bytes
SHA-256: 4f272881937acf1b3d3e6f1359482f862b50c27c18a70b65905bd4f42141f510

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