Malicious PDF — malware analysis report

Static analysis result for SHA-256 1edbd2eb18e3e8e6…

MALICIOUS

PDF

87.0 KB Created: 2021-07-16 20:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 367f218e51250315a06ec6582750c88a SHA-1: 3102d707457b7e35edd661b247170ad3e7e9edc0 SHA-256: 1edbd2eb18e3e8e60ac34b6ce62e64535d58b73dfce3bf6f58042263aa993ce1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristics indicate it functions as a link farm, pointing to compromised WordPress sites and disposable hosting, likely to host malicious content or redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with numerous embedded URLs, suggests an attempt to distribute malicious files or redirect users to phishing sites. Although no scripts were extracted, the document's structure and URL patterns strongly suggest a phishing or callback lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuppersbusch.hu/userfiles/files/82327357970.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5be4bf663f2709d286e4014ef4161f55/zobamofezare.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/tojegaru.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6abfd1780f---fakavavevuroxalikubokeje.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/fuxowotativulolafetet.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/ripawipu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ab8bbd5c---25479419353.pdfIn PDF document text
    • http://goldmustang.com/files/files/reriva.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/nugupudoditev.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/toxutuvinajoneto.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077323ce39f3---39990959751.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/60bd8ffefdaf88de52ddba5bc4593d48/15622976136.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/aqc7a08fid0vhh34kfomg76jbd/26023139943.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3569c1bab---74939405844.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dk3ir92r775g7nq6tgkai7tuj3/pajupurejutirisidelagere.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/xaxufut.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wabeza.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3e55105d4f08f0e8722f8adc1d4c6945/burikodejenil.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/80318d144b960ee29258cfbe69f1fff9/64991798474.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/gapimegisexofasikozezir.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3a45c547---rofigepa.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b0a44e8b---89317318487.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf034c77b---nogasagapixiwadiwit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=anderson+water+companyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708bb5478d1---1361588016.pdfIn PDF document text
    • 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_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 17552 bytes
SHA-256: 23ecf1abb58e0e4572f78c442b399eb9014c602dd3bece73c2635ca6970fee9c
font_01_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 10720 bytes
SHA-256: f7701eea042ec8e875414f5ee2ac98e4824d3294146b5b5c8d07e8d504f34ff6
font_02_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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