Malicious PDF — malware analysis report

Static analysis result for SHA-256 91886b188a1a0b0f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-12 00:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86a3ed79832b9d06433029da724c8b6a SHA-1: 502c9e0558029d7b5fc159d6afb611ae0d71dc69 SHA-256: 91886b188a1a0b0fe24ca394bfff26a350b3db2a068719bdc5de28cc50afe125
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with one heuristic specifically identifying it as a 'PDF link farm points to compromised-WordPress upload storage'. The ML classifier and ClamAV also strongly indicated maliciousness. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links, many hosted on potentially compromised or disposable domains, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/72305092751.pdf In PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/velamefetafumimilupuxixin.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/sujejonumilugewojakotu.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/78571448875.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1bf96011a---97838917851.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/81610813197.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nsgj1hvhi7gfeh4usfkrirkll2/tamiwipe.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/rimusiwimanudura.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/vorukiranazaxoxam.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/3954676900.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/28100971294.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/bulukilula.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210911_BEA7EBCB44CE61EA.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/97723589124.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/82181892065.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/14102863967.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/83249696737.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/ziwofijarujukanekez.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/zufawijefuraxumegimu.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/87804690705.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/disevelevakodovuxixexab.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/31385b6bb8012fc3f271cc698d74c4bc/kotumepevivinirafevati.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/47078753305.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/72156728946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=audio+manager+android+app+free+downloadPDF 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_off0000bb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 10740 bytes
SHA-256: ebb1bc7c081ea0bed665e5ceccfaee02d90c1f1ca3b8e018ae6c6c2bc6397f52
font_02_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 16472 bytes
SHA-256: 2242d69c1c8f1c7be76399c06da5bf87021b50cd8cff7ca4e572485b9355bf27

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