Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebcb826356e425d…

MALICIOUS

PDF

93.5 KB Created: 2021-09-07 10:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f25e40bc2582ba4c69b538529c466550 SHA-1: 190c0300ba4f38ba629a3682b5e3bffa3915688a SHA-256: cebcb826356e425dd162e3c6f1f03de8cc4d9e18e3f31e4451142cbbbefc06f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. Several URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm used to distribute or host malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://china-zub.ru/userfiles/file/xakosegewipa.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5867d21c50---97573957101.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd54a6429---sejukemipokorew.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/sewenonupawu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c574561427---14597277787.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798aa97ba6e---13507888125.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qeio9pm7ei2aa8jmaep14lec72/21613272638.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/52967249029.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f7bbe14ae---7573201549.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/pizirojegegabo.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/gisakopokojopas.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mobukaxejegoriti.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8a0fe2bef2ce3861d9b4179635f551bc/5578243406.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/17229806811.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/45960938203.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090a36e8e1a6---24788554785.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/85024979184cc311f8685340f3a63fcd/45727101478.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9161d6156---54012893094.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9ab45d014e3e5a5c617c26256e2b3cde/joremavemob.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/bemebele.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/47764608109.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/91366965f5e5bd19f3c6a38daa466fea/64936508187.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160986cfe39c5a---57039297364.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/et1894f1hcvpam8mvh1n9d90t0/19333926710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=agilepm+agile+project+management+handbook+v2+pdfPDF 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_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 11428 bytes
SHA-256: c3d1c64074a066b7aca047780bcc916152d45ba67b9b7d554c69c0807fef7650
font_02_sfnt_off00013779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13779 19048 bytes
SHA-256: 0b2e4bd035283d52919b5e09dbcfe53f8d4fd752fe93f97948fc156626e75d3b