Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d91696892213f8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 10:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e42164de164b06fd623bfc489deed318 SHA-1: 34faa16cb9ca420fe76e46b9a203329daad18054 SHA-256: 78d91696892213f8479927b6901e188ba920204e8e96d2993eb06210bbf3261a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is classified as malicious by ML and ClamAV, and exhibits characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload directories, attempting to trick users into downloading malicious PDFs by disguising them as software cracks. The presence of multiple external URIs and a link farm structure suggests an attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/643b0e934edde7da83d08b23ec1087d9/lifumoguwiwelof.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b89eaff750cd1bee5bf8d23698357d5b/parofadeja.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/48646151346.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/zapujiworekexinafeto.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/79490952577.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/15541601649.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a34d631f3---57439858755.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/10343064622.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/nitetejimupekiboxodum.pdfIn PDF document text
    • http://jar-ted.pl/file/61804379040.pdfIn PDF document text
    • http://teraval.cz/res/file/wesipovaju.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/xuguzaxo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c4ab5149f---865165477.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/vanuwesuwefigij.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/84955320464.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7616f4eb83a1c0fcb5071385a178a701/49346773654.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/18317503245.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/nuvafusipufovo.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/828d0b4194dbe219a42ac646d7206f5a/fojurefoxubebebejo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac673a9ad13---71101592527.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16096dab1b9792---3629627717.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/fidika.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/lovawaxos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=soda+pdf+download+with+crackPDF 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_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 18156 bytes
SHA-256: 420b0d5bbb7e9170d17c4d8bee5883eb7ab92bacdb7bce774103b6ac341c925a
font_01_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 10668 bytes
SHA-256: 3e31a15a7f78ba536ffccfb0de881b02855469d7d640b09366306fedb45b3eef

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