Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b6d3e30c2a429f…

MALICIOUS

PDF

92.9 KB Created: 2021-07-04 13:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2243aecdda0fd3a3ba9e1bb51688598d SHA-1: e5c32e5ed3cdc8b332d518a75e01e9a87a62db8c SHA-256: 54b6d3e30c2a429f2cab0c0a38e8d77ab4e1b00622591177049dd3070c504ec2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to potentially compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous links on compromised sites points towards an attempt to leverage these to deliver a payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160861596c005a---pedasovarevariwubukalexev.pdf In PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/6910b169e016d8086c8961e86ffec2b6/20200367668.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160858502359ae---60612412675.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/87486634257.pdfIn PDF document text
    • https://subarini.ro/mm/file/musobulizodobodasutu.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/zusodi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde04feed88---xurivonona.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/dupenapiw.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/wujudofokilejoves.pdfIn PDF document text
    • http://abc-tel.ru/data/File/11067213644.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9cd11dc3461336201d75ecf33b5aa374/67925953663.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d41a2f48f3c---38649563634.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/41635747135.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b2265836c26---pudaloput.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/36b08a9f92d776c09f331dd02939182d/4333914514.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a414e918---28011146759.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9766cbdd---22373330155.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/7cbb9868fc2dbb6bef0c40a26728e774/94507691461.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/329b6b5f16d4ce46aeab61940eeac8e8/81325829142.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nevoramifuguzugonesokel.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/70543167652.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/39985204808.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/20771831161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=overseed+after+aerationPDF 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_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 17228 bytes
SHA-256: 6c98e65d83a13beb541c642d2b57faabd3cccbf7ce18a9acfea88190c5a0bdb1
font_01_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 10392 bytes
SHA-256: 526e09ebd3e03891ce5f3e5c861e042632ae2cd81230eac965a0f2c0af2c3d47
font_02_sfnt_off00014d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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