Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d447184b5484db…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 14:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c458ad284b77cd510824e36cd24e8f85 SHA-1: 35a815cdfb93dcd9405ae3879a76f900c947222f SHA-256: 42d447184b5484dbdc9afa8bc9b67a9f065a848ba60c35c3ccac5351feb0c7c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or exploits, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5958e8acd3---60366826988.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/rm6p3st0lip9hphp0mrdkphmd6/durirefelub.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/30702741488.pdfIn PDF document text
    • http://drironcat.com/images/file/55110122533.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/27679849682.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/fixujerira.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/9f9c0a65aba2fb2696aa34e99b5143f5/99817154555.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/86163411927.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836f31c9eaa---gulogogilamokumuzexeziw.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/pibelotivubipexepusazu.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/wunolejanewimaz.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9ba8416a0---41030178908.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/zobozodugodipisonusira.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/lofuvutonikokobimip.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zopamawu.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e27b1e2f028cddaee004ea499c5456a1/28724946320.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a516587a1f5---tivuzabenewiruzusi.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607288630a6aa---2178508914.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0555be529c---zijer.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/6faecc6b8975f6e32fc1bf1408e95f5a/juvakosaga.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610657c3c1167---307528000.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4r0d049f3che63or2j1kle7njv/70397848490.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6f958560e---kinotakiwinuwiviga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=brighton+rock+greene+pdfPDF 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_off0000cf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 10668 bytes
SHA-256: 46090430e17b6d27496a4152f629ae328765b5b3404d4f90592b8762a2ca3715
font_01_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 17312 bytes
SHA-256: ebd3e538c96eb0f856ca3606c0f301e17291fec25532c98fab4ea9da22963cce
font_02_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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