Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9d94cbd6a81552…

MALICIOUS

PDF

112.0 KB Created: 2021-08-05 02:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fddb9fb5d97492f57b8ea8a458c3616b SHA-1: b704b3250be744862188f5c83313151603685ae2 SHA-256: ab9d94cbd6a815528a334ea90a6032eda262c8dd8807ad5d103493f0704efe2d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to make a phone call, a common tactic in callback phishing and tech-support scams. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd324208be---serezeg.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9ns4tng9odu3ehdf8gih5pus4r/55978273905.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/lavenugakiverov.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073766384ec0---paberononadokizoluzexog.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/9693767525.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/48437402260.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a7ca82054895d2b84cb7acb09c26781b/87715149789.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/riwumusadisibagagixove.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cad333023---vododokasa.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160940c44ee2d3---68904036475.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/5148895518.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b0d93d9f3cee66896019c7a41f7ed023/rufebesejaze.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/zikizumubuwusod.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/61058990224.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/b5530e49fd675ad8c33b15be8d0a2beb/44696431877.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/b1647f957997d8369c54aaf3749ec82c/xupitagavojefesi.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/bevesu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780335122b4---tugimavop.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094e2902e588---pemakegodesanifixa.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084751833330---68630381750.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/xobuzajuvosovibaset.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/4glafefehe4aufbcsgqik74pi5/66982054262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=henry+county+il+arrest+warrantsPDF 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_off000150f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F6 18252 bytes
SHA-256: 5a827fbbc2dfad09dce1aaa15ba70ae5de5b588a98171c169bb11bec35f78121
font_01_sfnt_off00018129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19940 10516 bytes
SHA-256: 11dacf0641883724461184a271cd15bdfffe5bad4ccc580ac1fe6c6672b89698

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