Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e6ba68b65ea75f…

MALICIOUS

PDF

76.3 KB Created: 2021-08-09 12:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd3f6ee483fdea897e3d6ba94caf6548 SHA-1: 1702e81364e9c750022e27426c407e3aa542c189 SHA-256: 05e6ba68b65ea75f297b61f78274847c3b1f5251312c6a364af90e6cf1beeb47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The external URIs and compromised CMS upload links point to a technique of leveraging vulnerable web infrastructure for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8edbfa36d284acb11212e0ea091ef9c/59488349405.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e9817fc09e40ba3ed1665b25413b2ab1/jaredevajogiponikepotifa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608910d36cb5a---99488005393.pdfIn PDF document text
    • http://btfa.tw/upload/files/jafumopexasutamuwudisa.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/d4138a3463bc8680e0bc11e3918be6fd/77726651248.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/rogugigezizumuwosijafe.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pvn0qb3uelccvb30r0j8lpf0mq/26012159020.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/30204668051.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/5f92740787d9989e63ecb359875965f3/gatebofid.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/sevatomituxavumobibunuka.pdfIn PDF document text
    • http://huefpdf.org/upload/file/16757760789.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11dbda8ac---47490292925.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/90568012136.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/30182805018.pdfIn PDF document text
    • http://nemalipics.com/87258659606.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e049e7102f---pujofogukibijojozeno.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c1452bd45---15194640860.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d18e4e13bc3---dobejalanubulag.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/tefofipozefizu.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/wereka.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/amgdvk48ack6eidf95j6uoh44m/fidalexaserabiruzozegu.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/83366799898.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/1505866856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+program+a+linear+garage+door+keypadPDF 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_off0000c611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 10852 bytes
SHA-256: 5f849d46fc22f8b1b426f56524b17bc1b6825f6845242041c45fb17268623ed8
font_02_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 16716 bytes
SHA-256: fc4a2d4b4d139967a0468b476cafa920160c77ca7be2ac7ba365fc68573d97d9

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