Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14ee4e19739fea6…

MALICIOUS

PDF

76.4 KB Created: 2021-09-02 01:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c38f1396dec8d4a97edc19ac445bd7f SHA-1: 6629f577e2eaf5f317d9bab5e5f4a4e75ac00ba7 SHA-256: c14ee4e19739fea6fd2bb3e31805914092336faac113b533445668ea88e1aab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/2d9c18b591762144b2da053755fedad9/kuzuxobajukixogajumu.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c552636016b---51217495158.pdfIn PDF document text
    • http://didopack.com/files/55405173498.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/56131716824.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a32465140---wegebasibeladavonawaw.pdfIn PDF document text
    • http://fitviewer.info/files/file/69833305897.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/kejazamu.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/8913015350.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4l9r1dr89cqqo84ij1gcptj1fr/vodufemevalupifivut.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/jagikiz.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/32948389392.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202108221046155974.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2f446993131a71f99fc8fd439a36ea70/12297580012.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6de34ea4---dafaganakivufonut.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fca4aaf6b6---rixirowavefemala.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/tigolulajavuxamelofa.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/62472997878.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/dafosefuti.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096b38995fba---galozosip.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/k745frvibmm084i3c0ng0gjbko/tofabifujivuvoxi.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736bf319c1d---39310461134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=changing+nose+stud+to+hoopPDF 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_off0000c93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93F 16604 bytes
SHA-256: 82029a0e1005bc89f3a4e1f6e675dd0f6bbf63a0e46a227e516d058e31efe958
font_01_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 10656 bytes
SHA-256: 149cc1097232abcc2c6d2d1bf470fdd211d1fe1c839a57bc1cd0fcff55e284ef
font_02_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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