Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cd3fd4c81b8a44…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 12:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9e0fd66abe9b4db711f5fcfd05d4b8b SHA-1: cd90ac4d8fcec17827e855841ce2d06442a599b1 SHA-256: 58cd3fd4c81b8a4418a37a76ce70983ab9443d959ca466ae324111e12f783a2d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is unreadable, but the heuristics and numerous URLs point to a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://accessprecision.com/userfiles/file/kepejazive.pdf In PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/52105705560.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/61973905668.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/feribifosetureze.pdfIn PDF document text
    • http://momsystem.ru/public/file/33233050397.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba02310ae15---figelidazomolegoj.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/96610976423.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/nekin.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/modajodujosiluj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093caa94bf8b---mawejivunajafetiwudapopim.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf4fbb1a9a---47347676463.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6701e1cc80---41421755480.pdfIn PDF document text
    • https://bachson.net/upload/file/famosorisejanitabeluweke.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/72081795651.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a8581d4a25---31960283396.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/naselatatiredavamun.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/88298135289.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/97597036218.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/dodipug.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/41c7cda63ec1f0e533a71ad366921881/67843716905.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/najewuverarago.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/nsckst5cqn8toof7q5q1b30j53/87154435380.pdfIn PDF document text
    • http://deauville.ru/files/file/xiderupakimex.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/62569263799.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/63007564461.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b11ff0b394921149c16626e76cd2470c/najusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=computer+accounting+with+quickbooks+2018+solution+manualPDF 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_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 18632 bytes
SHA-256: 827167aebf7bd7055265e62aa9a53968a9c475f7eb7762e6a5d13fa8e17d5a77
font_02_sfnt_off00012cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC1 11920 bytes
SHA-256: 2b8afe01bb3c2c0d20a97b33bfb1cee8d7145a121dccbb7578050d8b3a199a76

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