Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad3504e8dc92685…

MALICIOUS

PDF

88.6 KB Created: 2021-08-22 18:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef8703d25fea8152a9527751930e5d13 SHA-1: 337ae3828ea567d0b793ed709ba33708cc7ce46e SHA-256: 1ad3504e8dc92685c1667ed020b1f6bcacf8ae8d322d7ac644fd713097459130
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URI heuristics and link farm indicators further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://burgas-remonti.com/userfiles/file/44029026010.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e745db09723---juleruwinuwenuxizomam.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/55ec6534db985284d8cca81b76000828/52931990613.pdfIn PDF document text
    • http://rld-carbon.ru/file/xezolitu.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/23550021016.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/betovifabifabomadaxaje.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/wezon.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/letetu.pdfIn PDF document text
    • https://angkalaris.com/contents//files/sisadezarukajubufivuma.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/32864109975.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c707aed96857e6fae6fe2fd5c45900b3/gekuwusimuxufitosadufis.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/csn4o2etu6r6m7cac1aj8b5qv7/1030551405.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/59844277939.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/35819168154.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98648038378.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/netelonezisipugomokiwiro.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c52b4a0c2---jewuloberefejekukijune.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7380e752a7---67002848366.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/gapenerizakizemoxerawapo.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/riwejolepuvepeki.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/10809910152.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/0aa7267e71c59bed74b7bd9aaa0a341f/gifudebuxe.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae372a79e92---fejumadin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=us+history+chapter+12+section+1+quizletPDF 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_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 16840 bytes
SHA-256: a0fb8f286e0ce2b7ab98f9c4e60968dc664f8ac555984d430ab2542787f7bed1
font_01_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 11068 bytes
SHA-256: 1dfc7a8f60ed8141109c5a46183271e9bfd60d624c5139a9157316ffee2664d2
font_02_sfnt_off00013b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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