Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a23156d00bac188…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 10:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fbefbbf5727efd6c367200b36b3f49e5 SHA-1: d5ac862871f8f6e7cd28266dd5f0e91e3cd8f853 SHA-256: 0a23156d00bac188aef8e9b2b1047ad2ee9e19a390d8f673966ad79134a1da38
176 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates a potential phishing or tech-support scam pretext, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://zhxndl.com/uploadfiles/files/fikagomurinuvunafese.pdf In PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e98060d26acef3a127c5a9f34e7e4fb6/99966251758.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/rinunezunarekefumisad.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb47144d3---zirotapaludokezazotudegux.pdfIn PDF document text
    • http://zxsolar.com/d/files/71602833560.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/53274381000.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/wirowukuduxuj.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/74755871190.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/26393290228.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/xobisinukafe.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3ded3f335a361ec240d86ab548a81fec/letisitivixijosodebal.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/tovolimu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161434546db5d5---mubewejabefik.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/46617593513.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/18908341022.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/38975151005.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/vujeninexulitubotafawa.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ece42239---purasebetitagavujeziza.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/45002653437.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210910220515.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/fiwasatavilukevowutotup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+switch+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_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 17184 bytes
SHA-256: 15dccb1e0ee7bf42f1dc871567dd06dc7a4bd14201c53fe7dc535e129730e85a
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 10656 bytes
SHA-256: e72e20ad462f0742178ecdc0b0d85505f8824b2b8c4975e5297b5812dd712348

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