Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f65d57e49a20056…

MALICIOUS

PDF

92.6 KB Created: 2021-09-01 07:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0066a26fa33399a385768448599e1f8 SHA-1: 20e593b3b352330b5157f62983b7e2192ac234b6 SHA-256: 8f65d57e49a200565ab391193edaa389c54ee4c25644b606b9689045e43f9123
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Numerous embedded URLs, many hosted on compromised WordPress sites or disposable domains, suggest a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the conclusion that this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=their+for+inanimate+objects PDF link annotation
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb4e927b2---76684795472.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/37972788990.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/mvr036v4ijerv7phdg15vsfmn5/21485686601.pdfIn PDF document text
    • http://alkanboya.com/files/file///pokejofozebixatekajetofu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3rpng5opfhic9a7v6gjtrfbilu/vipizosogewopawodal.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/53566699393.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/7445235191.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/p0s0i61aesiktl53torpc6ch18/47005711558.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/zesozibur.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/zokuxugipuf.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/74276ed8aea02f7582b4a49cac620767/98280746735.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b7cca0ad3fa25ebf0ae9f0f5ed0b4c78/todif.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608491e8099b1---surijafix.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/71561726231.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/kofekenezugigexepab.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/jivenifitunelijugut.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7d121cbd7---dukitikutasowezepaniwipej.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b1eacc383---xezezatugokusaxodidoreke.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/69441112882.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afa1a2db2---xoxedariberedimatekegewux.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/jolerubifibeziruj.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cc5a465f34a497883357bcda6e7bcb58/10733863696.pdfIn PDF document text
    • http://zenithmetals.com/files/debat.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_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 18948 bytes
SHA-256: d842c708e1663a388c330ad7c5461dfeaf38a7636da270f0e3a8655f4370c9d0
font_02_sfnt_off00014b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B45 10788 bytes
SHA-256: 9c7ec4b751f4597e3e84263c31e29ec62cef7755cfbaa5471801ce7b861be6b7

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