Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f96ac49707325da…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 10:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9fd622f2d112c5efb5a4486616da0e5 SHA-1: d6a4cb951050ffdd17644de5fd41623993466329 SHA-256: 1f96ac49707325da8d4ca39fcc5e0d0975977ef2b491206f1f92e3b291580b83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with multiple URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious activity. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content, potentially via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16095fafb424fb---9590780697.pdf In PDF document text
    • https://ruh-center.ru/userfiles/file/7009755871.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ds2jdpp326lh84palrsq1qdl2n/bemusadorerodenadive.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210724004241.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/h024mgj4rfvm3km9vjrgtg89qd/74760927083.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4452f2a217de74b8a6c924e0e113b0e2/vedumijoseki.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/nominafibovowuni.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/49cf5b6a40de21386af42a89847e297a/87346830059.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/75233769719.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/limotozus.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/6131935434.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/wilakabumalotigesof.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/rofixejuxopojawowedi.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/nouiq4i1t2be8epnnfavm9k1t2/kuvinezatukodi.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/79078711018.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0f203f99fbd893a2e8c233ba8e2a4b9c/sibedujonozun.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4c6e470ca239a02f2945aaa2580695d6/94645605229.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/da4ee9084a54c3dd432a9120875fd6e4/35174233491.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/korifivasufidataf.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/9256257265.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/44228014453.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/35702000465.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/fe94e27f1e3bf6dd914bd13c7efb94db/xojozuxixito.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/36810671960.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e001b04f26---40069407317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lcm+of+8+and+12+answerPDF 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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 18612 bytes
SHA-256: c9625487cb8b71a4721f24fe154c7c68a75df1081fc204d1bc4b4971b7927749
font_01_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 10824 bytes
SHA-256: 7244746d1ec9ea7a5e52dec9e49bada25b0555c43006a64a5f6d51c6946891f8