Malicious PDF — malware analysis report

Static analysis result for SHA-256 9643e09495fe1907…

MALICIOUS

PDF

103.1 KB Created: 2021-10-06 00:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f61c3122f26bec5136c34a9bac938f17 SHA-1: f4d4042cc0d28329da0affbbd1596eff037e0f10 SHA-256: 9643e09495fe1907ebeb2d772f045ebe4540665d3d76bee18f4ea59c29d87f3c
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious link distribution scheme. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users to malicious content. The presence of external URIs and IP address literals further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://zs-oilfieldequip.ru/d/files/xofolatazutubemu.pdf In PDF document text
    • http://atol-res.pl/uploads/file/88509221562.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/60374103131.pdfIn PDF document text
    • http://warehousetraining.ie/images/nenafavofebibepuzorab.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479c00d1851---wofaxiwujekimevam.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/mirurubuverodes.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/55430776283.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/wukopokapamusoretir.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/54189618386.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210909_052655_3825.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/ziwis.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161505f39e9882---xedikozoxiganumigejebajop.pdfPDF link annotation
    • https://nbretail.com.vn/ckfinder/userfiles/files/nalulotila.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/19256034626142001ac32a2.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/muwina.pdfIn PDF document text
    • http://healthywithhart.com/res/file/nizikipidipalovazariva.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/95fdbe26da41608c822a18434a1d0046/38271627970.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/21457223135.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/dulanuwuketazuzupubok.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/luwid.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ffc1700f8---19409898942.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/givujegitaxijaxoje.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/80690898544.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210917_125043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=who+is+the+most+richest+teenager+in+the+worldPDF 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_off000128f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F8 20024 bytes
SHA-256: e90a049d93488372e52780a47452c7f97d45f194e2d190519a3738366c26c045
font_01_sfnt_off00015d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D34 10896 bytes
SHA-256: 9c5ba0a26290b5df6332e7db7d9524bc6cc3b042aa025dd48cc0786611c22cc4
font_02_sfnt_off00017619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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