Malicious PDF — malware analysis report

Static analysis result for SHA-256 309922b584b8f325…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 02:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e889785f9621e0daf464ac4c8ad09728 SHA-1: abb295a43087caf4934705b133d8b2f5fb6a79ff SHA-256: 309922b584b8f32554df8239d8a8bca78e5ceb61f6a6efc90ed9fa0efa15e9a4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of a compromised CMS upload link further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://immobiliareincentro.it/allegati/file/pujelinozakutezozinodage.pdf In PDF document text
    • https://milorem-service.ru/userfiles/file/9962867691.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/93614762865.pdfIn PDF document text
    • http://alptw.com/images/files/gevivanugikono.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/75124476837.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/9645849388.pdfIn PDF document text
    • http://learningkey.org/userfiles/54998754050.pdfIn PDF document text
    • http://keramann.ru/uploads/files/gojegevizuposi.pdfIn PDF document text
    • http://banquat.com/userfiles/files/resezogogizasiw.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8da4f2b4---wutuduludokafufokonufetuj.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/54756218989.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/72650627822.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/vozunasawezerixuxon.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/xowulodimaverupenenudefak.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/46g1vtontb3u66qe3vvn72judb/21619318745.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6e61e0cdec7a72d809ebbfe9e5fce8bd/lugazitezuposevozi.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/petusa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bab072026---88884329947.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210913101203.pdfIn PDF document text
    • http://mqskin.com/luutru/files/70005566975.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/xokiviveluwotu.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/95059342735.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/38775761932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ipad+view+dynamo+gaming+apkPDF 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_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 21752 bytes
SHA-256: d6b77d2e3b01d535c08b7e968a3a7cbf4261e6ae1cd5ca7dd5e6c7caeab63ab4
font_01_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 10632 bytes
SHA-256: 4d6c923cbbed30689dc0a080710111d0aa456afda28836b7daf85f067a67a851

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