Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a296020670a3ff…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 06:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3843e0a1e0e7868e1b76d7f6133c77e6 SHA-1: 88b55bd785d6c98eebb74280713c5d214b1a64e1 SHA-256: 16a296020670a3ff85b5f75ae05e8518eb11d8730002c863377d12ced09193f0
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://safrano.pl/userfiles/file/46234105690.pdf In PDF document text
    • http://lagunaapartman.hu/images/user/file/31979813365.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/jorumixobiw.pdfIn PDF document text
    • http://aweibel.com/Photo/file/89130744428.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e70424c8d60c5363f6e45155875bbb04/47102960637.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/dufukodilu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/5c48f6d65b9cda0e14ca7307e970d450/57515662747.pdfIn PDF document text
    • https://rajaunited.com/contents//files/80915346481.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/zejeboteli.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/wiguxepirepugafenuvidewa.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/sadagili.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/q67dn6ogarih5rfec6ct9ef6s4/61167660081.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/71533285809.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/fobopiju.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/xalapugeba.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a8961408---tamubebu.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/simitutilirotogesi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/36679426008.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/68694873285.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/nulujikoxozemuke.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8p7o67l73n9v0qglkvvm83sj33/22592456580.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b4e7538e---46318658142.pdfIn PDF document text
    • http://jkohut.pl/file/15263628525.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/r030j8r7k3okekb7q08pntblh7/6534780916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ictericia+por+lactancia+materna+tratamiento+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_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 10564 bytes
SHA-256: cdf38f3e58a6f6c73ce4027cf1959e8b71a62226fc0c4209cab28924d0abe25b
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 19772 bytes
SHA-256: 7d39932d69a0ee22c64ae29b1c886763fcb748563fcbd4040f9b5f95f52873f5

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