Malicious PDF — malware analysis report

Static analysis result for SHA-256 d103498d0c04901b…

MALICIOUS

PDF

88.5 KB Created: 2021-09-03 04:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c25bd829cb8b0e92976b1edbe96a1fb4 SHA-1: 68933655780f52d6ded0f604fcf8817ac12e65f4 SHA-256: d103498d0c04901b9a22dae654809a2500fac7a0c45a2a5ea1f1cd60f9d298bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or further malware. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pretext, although no specific document body content was extracted to confirm this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ba85b1ab00c6ed12da255acaccf2adad/99165498551.pdf In PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ape35chbvngv05kvaugse5m4ln/22177734469.pdfIn PDF document text
    • http://www.centralperdana.com/file/bapufubudavosokot.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/ponifuxama.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/56d9b0c604550691d07ad0aae75f54d7/rurararulujesakiru.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qoopi6m31opvo914ve4dhtihiq/37694192988.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/15193164041.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/8bed3e3fd4c3dce28c0bcd4beec3f430/2991379418.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/1054588523.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/30002356752.pdfIn PDF document text
    • http://amdind.com/userfiles/file/29279813531.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/gitowegotirusavolu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ea3a019caf1b4d056fb37cba0896e4bb/90191324547.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/22366851165.pdfIn PDF document text
    • http://msiutilities.biz/documents/33630009801.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/amv0fq28ssu34s7psrejbh9d4h/63319806960.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/gumisufifi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wogidifawidixazufetavolob.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/11856547374.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/dusoxowuriposi.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/87950349533.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/sugazimaworimeleminaz.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2381d7c0d---fuwudiziwake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hindu+devotional+books+pdfPDF 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_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 19568 bytes
SHA-256: eca0266f7666c9e87dcb4dbe7e1da7017044a50086349a5ae25885809248cd67
font_02_sfnt_off00013b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B75 10780 bytes
SHA-256: afb4cf61ef8dab32429b0684cd9f28f3bc137e083d6f1406c061b9a8ded107d8

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