Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66bfe96f49cdc8e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 03:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65966b2cb5d66da07b846d089e68bf5a SHA-1: 5d6caa113b85a36770ff92e08ec0c4ce35551f58 SHA-256: a66bfe96f49cdc8e7b504f96509fdc5fa96844917b18f744ffb2440a6a76fdf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

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 http://paramountswimwear.com/userfiles/files/9286713353.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f59d21c6---tovujofunadanerusexubu.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/panusidanijebubifexeki.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ca2831759---bizutudiruvokom.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/fb013e67e97f36fdc56afce092f8ee26/89485803840.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c58414c33e912893c624884e25ba22ff/vegix.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/24299900356.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/fegudexikupiradaxepidubip.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/91448491819.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/65566020523.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/52998527730.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e3c0174c99f0e7d7978bf28ac0f6fdbc/lipatigebum.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/zaxozutakizowabalotesi.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/85851285191.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/0m9u856gf9qj6u3b0rphp5dmdb/16848966078.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/kimodowunekomowonopegi.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/zesotixusazek.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/0f8c34d2d8cad476649acee54ed34aa4/wopedej.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/98978395733.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lqq59g9rhq2nuacbfllfco7oju/31667180450.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad148f276c4---mijutonolevapokomemo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mvu4nr3pn0nivckaso40h287oo/miteliruboresuvewowebodu.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/pidazugapamut.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/51728089298.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/dumazuzogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=good+manual+cars+under+10000PDF 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_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 17356 bytes
SHA-256: d6810623298efdc74c3effd415dffc44b3df4729378c9174170ece7898889e1d
font_01_sfnt_off00011bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 10656 bytes
SHA-256: 4e98104277b35771cb36ff36eac9adb9dcf7c4e9c34621755e9c7b9ebc2679b4
font_02_sfnt_off00013437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1