Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd768e741ad11ff…

MALICIOUS

PDF

154.9 KB Created: 2021-08-08 15:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f80465fd4c51830c1eb6bf041ff700af SHA-1: 93e499d87647a8e6f1ccbfdf0b3ec7ee08b1c68e SHA-256: 5bd768e741ad11ff4ab62a8ab7eb1186d36426b5dfd10a94a3cf0402c3a66a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting, likely to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b781ab95da---widutafiwegagim.pdf In PDF document text
    • https://topclassgreenery.nl/images/file/42920395122.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/35996871431.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/37534540564.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a88b90b0d30---64259519931.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/ruxoboferufubumarikebobiw.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6d18deed7edb4d282b369c3ae36fe248/80448045692.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/sivotomibisefu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77e98fc82---86462980035.pdfIn PDF document text
    • https://ikima.fr/uploads/file/43198454627.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b264214d0e7---mofegutavurovowa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee8c09e8a7---1545609847.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf7ab740e---morefu.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/bebap.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/13204409687.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b73f7c02b---valesoziwaxerugepokox.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/dijimonulovuxezabawuperup.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608310e920e38---97637212369.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/fitajepumotozukob.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d921e86cafe021876902f9909951928e/gewuribasofefusibodolapu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160719f4883a1c---rekoleresojusulu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc58681e1ae---87449520960.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6fbbc9a1---ziriwevofujewim.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f7df0c32e---jukagukazobi.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/tubifowurekifonav.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160739bf89d4d9---vowafesaberigaxitulikumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=burger+king+have+2+for+5PDF 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_off0001f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F85A 10744 bytes
SHA-256: b52aba5f3c6a5410f6fc2a74784b653eb03d48f55c7f610c3eda9c6a1676fc06
font_01_sfnt_off0002111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2111B 19548 bytes
SHA-256: 41077be63c9e6e4662bde530e8ad229722b13441ad243d06b21466f947505343
font_02_sfnt_off000244ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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