Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8402f8996ce3b5…

MALICIOUS

PDF

64.0 KB Created: 2021-09-30 12:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0cc1433e88aea817c2a51cf3ab4fd57 SHA-1: 69552731a2fb012c939c1e2f1afbef201284b12d SHA-256: 9e8402f8996ce3b5decea4ee079249c01a3eb60cbd10f4c41f57cede55175d94
194 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 phishing or malware distribution attempt. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, designed to redirect users to potentially harmful content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://archiw.bibliotekalesmierz.eu/img/upload/files/56100999914.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ias4hktra7dqfbpb0ug62avm55/fozopimagugojolebefava.pdf
    • http://twfbs.com/ckfinder/userfiles/files/wupatugibob.pdf
    • https://iveducentar.com/uploads/assets/file/52058392948.pdf
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/15399611813.pdf
    • http://www.prctech-th.com/ckfinder/userfiles/files/70564129124.pdf
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/37090259040.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/rubedozadupozujenukam.pdf
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/nezam.pdf
    • https://hongmao.tw/uploads/files/202109232302248739.pdf
    • http://marthomaiticherukole.com/userfiles/file/finomutemezos.pdf
    • http://precisao.org/files/files/wekef.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16149138746f62---49739701025.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/unev4s3nsqh2ldc7ijt174vtl0/lafakikozetavudunux.pdf
    • http://alnahamgroup.com/userfiles/file/40768211733.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/73866053088.pdf
    • http://yingtailong.com/upload/file/210920032300010998exz5ppvu2ovt.pdf
    • http://vincentianssjp.com/userfiles/file/69101858603.pdf
    • http://pierrevillers.fr/mairie_files/file/97487330601.pdf
    • https://0900107678.com/upload/file/kugipikag.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wubuwakagavitajowaguvudo.pdf
    • http://adance0112.com/upfile/editor/file/47586790753.pdf
    • http://sungder.com/upload/bewisopinowixalokepaj.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161469986e0249---77459971375.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=123+series+downloads
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F8 16792 bytes
font_01_sfnt_off0000cb0a.bin
17888fd9f99db1387b92449a679c35f7b6d981035e274dd0e87b8af000e24dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 16028 bytes

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