Malicious PDF — malware analysis report

Static analysis result for SHA-256 120b8d07a9e78874…

MALICIOUS

PDF

103.3 KB Created: 2021-07-05 04:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9af6d8d12bd659901e5fb82bad9e044 SHA-1: f290f4047818e6f21fc21ca57208767834613cdb SHA-256: 120b8d07a9e78874b686a296c38b5a33801e3079882ad5345639a118e753b8a7
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to external PDFs hosted on compromised websites, likely serving as lures for users to download further malicious content. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the heuristic firings strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607211b88532e---nolopenabujafobogaz.pdf
    • http://sarlampa.ru/upload_picture/4349720272.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/3s59tomsu8rlu6l4sr4iair0s3/nekufifot.pdf
    • https://baxsporthorses.com/userfiles/file/gonuxebosekex.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6efd70d6---38432587851.pdf
    • http://busankid.com/webfiles/board/file///tevuga.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbc6d78e3---wiramigenezisaluj.pdf
    • http://karinameal.ru/imgdish/files/tegigojepaxogulibi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c08d057f1---gupemir.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lp9m180sraf8nb2jpr1nrg2n73/99930699270.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2afe5e9d0---xiromusuxupawutasixeresod.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef312b7df3---mufukebogiwulizi.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ad139766f0a12a38bf96463fe578b1de/wufunifab.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5efc2ccabc9668be72396b9eac539669/83301478170.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d55664c08---74340430706.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/17612085008.pdf
    • http://skiflogistics.ru/userfiles/file/21581969931.pdf
    • http://aftckwt.com/uploads/file/dipivetubitezoma.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/savol.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/051ace8de7f225e2ad2f315abb417b30/25794521851.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l9ngpd14fsvjhc2alt7rrb8a8h/xibobitorije.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bfdd13f58---11163669933.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=operations+management+includes
    • 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_off00013190.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13190 16792 bytes
font_01_sfnt_off000149a7.bin
7f1db62117591ad27d190d1c8112217dd72b05a6c472ad0e1df83aaf6841330f
pdf-font-stream PDF embedded font (sfnt) at offset 0x149A7 10984 bytes
font_02_sfnt_off000162f3.bin
6dd086026b174b3b7014f286da5dac4bbde8d7d47644ba62fd6ace3f32bfa001
pdf-font-stream PDF embedded font (sfnt) at offset 0x162F3 17348 bytes