Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa135df4fddc9f5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 08:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04419f86e1bad1e32c8cb238e5c6b369 SHA-1: 7cc74ab156ab292105dfaff7d7ab21db3109ae79 SHA-256: faa135df4fddc9f53a26fc551ca2ea688467f0720c76e148e7078056be7f69ec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites and potentially malicious PDFs. The embedded URLs, including one directly using an IP address, suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and heuristics strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://legalinet.eu/userfiles/files/99549070843.pdf In PDF document text
    • http://elrey-uslugi.ru/media/file/55817143760.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcffe406dd---80257944410.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/97bc35eeba089fea20d17cf0cb83c155/3109225616.pdfIn PDF document text
    • https://laps.pl/userfiles/file/zekogowafoluwugalidonot.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/38598601254.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/da975da2398b99b91e51f6cd428175c0/jiwilifuk.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/92862525454.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/30229493150.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/fujuruvaxadun.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/27067276956.pdfIn PDF document text
    • https://clove7.com/userfiles/file/51989465855.pdfIn PDF document text
    • http://xinyuemu.net/assets/202108/files/20210801075919824371.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/fc1c8ad42cce6fe11142228b35c03694/sutudap.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/529501e8c20187ce0b2665b3a7b456a8/dabikenel.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a611f20cccc0239ee00f1d827692e969/veviwotexixukelofafolu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d76e16275c3---suzuvevenipibaborogum.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/zibamebenapifamorokatuta.pdfIn PDF document text
    • http://ridendo.cz/files/file/701210641.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/79720913831.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16099d45dd9847---11684841287.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+apparel+merchandisingPDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 17092 bytes
SHA-256: 91965040e240bc6d99323eda10652addafe60d55a42d0d5db7b876ef838694c2
font_02_sfnt_off000120a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 10832 bytes
SHA-256: 4c018e5a3fc0b3d81513574a617f31bff4fb36ed77f5c3a009d6211510defc2c

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