Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9037e18f05b730f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 03:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51dfa907214425d55fe6456858c5931d SHA-1: c77b22495d8469dc1b9742b038ae93cb034334a0 SHA-256: e9037e18f05b730f5fc8b0ac0ae381f98c731de1323ee2b08d2478beaecd6a0b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://queure.ru/uplcv?utm_term=experience+certificate+for+driver+format+pdf PDF link annotation
    • http://alltechsro.cz/files/467828355.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b903beedf8---mogezifiluxigul.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/gizukirabapepafipifen.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/8468121164.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/59137656905.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/6618719932.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/jujuzaluribekedet.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/9ka8nsq94rql7rgs2k46jmr6q6/90017465325.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b8d79889e---duganafijaren.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pg9ai6p9r7mri60qb76jdmolol/foviwopamanaliver.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/94924302291.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161218fc076d79---nojiliju.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b28eb57dc9c---56870285377.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0a5c0491376af74f32418fc2ec98745c/98967029810.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b41fb6259---40338732171.pdfIn PDF document text
    • https://scalper.ir/data/files/file/disepenudawuri.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a172f150629---wigawebebijanob.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/vezita.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ba72106fa---gupevipoxupasupakitove.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/83607182000.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b73a2fc3---87021895034.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_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 10716 bytes
SHA-256: 96eb96d1e35fe6007bafb9501362bacd0699b24c4b895860c3717cc189a0553d
font_02_sfnt_off00011bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD1 16684 bytes
SHA-256: 03d2ee495f490ceb978978d190a26a2a58ded9ddfe58d712bb6add7bcf6133d2

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