Malicious PDF — malware analysis report

Static analysis result for SHA-256 172a894e79550a2b…

MALICIOUS

PDF

83.9 KB Created: 2021-07-03 04:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5115f7b028d3410ac743f5812c837051 SHA-1: 2a796fef93f4ba5c096d15896b5e39fce90ea667 SHA-256: 172a894e79550a2bcaec265328d569f4af6399fc1b4a2254626fe56230593adc
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself does not contain executable content, but its primary function appears to be hosting these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d0c216d5e940659b8af0cec4975477e1/pasoda.pdf
    • https://araprinter.com/ckfinder/userfiles/files/47655169005.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/306b8a6c0bf9b8d2c853080c1aa4b671/kunigegumewax.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/c012a98a122a9b831d6e42290c2eca5d/83861256247.pdf
    • http://guides2alpes.fr/uploads/file/97153089947.pdf
    • https://gruntbudowa.pl/files/file/bumevaridokimekapot.pdf
    • https://guruamardaspublicschool.com/userfiles/files/19938745026.pdf
    • http://suamayin.biz/userfiles/file/923563803.pdf
    • http://giasuthanhdat.vn/Images_upload/files/bomewilum.pdf
    • https://campermagazine.tv/public/file/mevoremidajafe.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/clc04bq230k6knprabd6mdngi6/pixur.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/863344ff53387360dcba6b1bfb41305b/62392907994.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0b856eeb3fde79413e8b74a4224951ac/xivurelukutogilatafise.pdf
    • http://toonesk.com/upload/fasete.pdf
    • http://broadgatecapital.com/userfiles/file/74639810988.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cervical+dermoid+cyst
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e504.bin
86fe5c259d72d54798165a8fbdaef91efbfb4f5885838b6ea642f89fdc9f1b84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 10640 bytes
font_01_sfnt_off0000fd78.bin
493acc815cb9a8e74ac4b8f9397b2dd854ec4f574481133f53bc88f6de845b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 17304 bytes
font_02_sfnt_off00012adf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 16792 bytes

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