Malicious PDF — malware analysis report

Static analysis result for SHA-256 381c178411c20e1f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 00:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ba80db3cac71baee16f2c32c1f3dcd1 SHA-1: 0e40cafbabe47a2d6187e8592f682f5e586163c3 SHA-256: 381c178411c20e1f0163bd52077da0a0577a40ce6bd44a54011adf629b11d8a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=niton+xl5+pdf PDF link annotation
    • https://secolink.sk/userfiles/file/nefemaguwomajap.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/worimuzebemenafajovelejun.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d202675b8---zugixudok.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/c8o0iuj61rli1r801d4uqn6mk2/gewigakuxogikizujifapuva.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/bumatifilabakid.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/85b5eeacc587cccf9e099147573bbf24/44364207768.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/gixobisakafiwes.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a026578568d---sutenipekow.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078554be729b---bobesitiragulo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9365d8f392---616797573.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/zanajitagavovo.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/naxizedalutod.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/8f846450fa61eea5684e8a278196fa64/wugowovadewomigamojan.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/baxutuxote.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/41020880373.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160deb28f8d8c6---lejujitufukonisafexi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4090048fcf605e792f3fce685646f002/59841123006.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c928141d2a---21251645469.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/91086083795.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///xilugofo.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/xozikeperixeseton.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/4142818327.pdfIn PDF document text
    • https://atavio.ru/files/file/33812345902.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/84208377735.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10140 bytes
SHA-256: 29c23c31c1aaa60fd3cad1efc132746f9a567821b9e8a5439eadf13200381c80
font_02_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 18540 bytes
SHA-256: 67d1d20ba790e7533d0d8da6359a4508d4df97f3e7259d83bb02c1cfd715fad2

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