Malicious PDF — malware analysis report

Static analysis result for SHA-256 951da98d0e6e5867…

MALICIOUS

PDF

95.3 KB Created: 2021-06-27 05:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c8cf520f25eeb9b555cad29bd8d8ce5 SHA-1: 9d4ed952e7dd18644878d4643d4901abe285bfc1 SHA-256: 951da98d0e6e5867bc68095418948a74f5e71a7cc1d778e2dfec27ac26ef6ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://challendor.com/fckeditor/upload/file/24809677571.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f246d78df2---vixiropoj.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251f239274---46668271053.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd8895e6b---volakogazowaxukixalu.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a96a606a0---kubosebu.pdf
    • https://srmhospitalities.com/images/bulk_images/files/54120831186.pdf
    • http://bmcnx.com/userfiles/file/rusabegoremirokizuni.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/951f7cddbb139d84f9d3d7f4d1ef90a0/kerugidugezegibiwuwemux.pdf
    • http://www.klimavill.com//data/editorfile/tukimenukezoj.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/i4lusnmfieu2cb2fcp6iaiq2ga/fotazitaza.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160896a46cda01---71147548455.pdf
    • http://pantryscan.com/123cars/imagefck/file/96183518070.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607576ce2f0b5---pipokixerifav.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085357b62c15---jetozufakigu.pdf
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/22994530200.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c98855b44f1---27685146350.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16a71b603---bopiravanebufefofupawosu.pdf
    • https://ctapigroup3.com/contents//files/32747409542.pdf
    • http://archerelectricsupply.com/userfiles/file/36515409182.pdf
    • https://cafesca.org/ckfinder/userfiles/files/vinoxakawizupevaxinu.pdf
    • http://smitheaster.org/clients/861344/File/wamon.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9cb6372b---puwovelivolapopew.pdf
    • http://bloomland.com/sites/bloomland.com/files/lawewofuli.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=example+of+chapter+2+in+quantitative+research
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011201.bin
7e0a7f9625996b5632ce01a2bd9e35d1c48c51068987ddec0ac98136457b83a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 11264 bytes
font_01_sfnt_off00012c4f.bin
eb62a5579a3b4f50acdf975307e657dc8039ba6406edebe6c0eb3a7f2c4b8c11
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 16812 bytes
font_02_sfnt_off000157d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x157D7 16792 bytes