Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeecc51d3a94900e…

MALICIOUS

PDF

88.7 KB Created: 2021-08-13 22:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2733fcbf1d53ce83471230500f050674 SHA-1: 6dee42b126e48f33aa83f188a3b12feed21c7115 SHA-256: eeecc51d3a94900ea337446891edd252fd144bb7d9cd5ac0b777438a73f7abae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/e621b6681add398c455a542d5cb9bd7f/60521078737.pdf In PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/42672229480.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/4356877143.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c789ec706ca92cf8fa49b274ecc97df3/33299189242.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/45248013944.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/midufumafag.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/621eed2c8d3f78645f71628d2aef058c/8257081056.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1267ede507---bunopowepisebukile.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tixupin.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf96c510d60---36753929836.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/wixebam.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///58622055336.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/f5q752k6b97f68quhibfebakt2/65473659967.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/45762345226.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/11788945722.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7404de58938509a79276e815d0fe6722/98937392000.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/75037529636.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/lewopex.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/xeven.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/pifudifadegizekamidigedif.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/xanovobajejigewofedi.pdfIn PDF document text
    • http://tillyardci.com/userfiles/file/sivusegunerosemozikulakos.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/weramaneva.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-07-07-12-07-19.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/dagorezotorafigegixunipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=why+my+maytag+washer+won%27t+startPDF 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://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_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 17448 bytes
SHA-256: df27370ccfec2710e70729ab8fe11f6512e9ecfddc3b0681c3c9cad53e7ee918
font_01_sfnt_off000127a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A7 10644 bytes
SHA-256: 1eff90a6a2f9b292c39fc6800f69db2a7ea93c4569b6ae21a6bdc71fce882cb1
font_02_sfnt_off00014003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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