Malicious PDF — malware analysis report

Static analysis result for SHA-256 11170ed5d1e2a064…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 02:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28ead0c94ba4042b166df34768333fa1 SHA-1: e4eea6d19d2b8b82570304a30bbd46824b7187c6 SHA-256: 11170ed5d1e2a064bb88f97d9f73678be2a4701c92dbf8eaf109d83bd32b6092
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious payloads. The presence of multiple compromised CMS upload links suggests a tactic to disguise malicious content within legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a237b091ad---32348648180.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dae5eb965a---petufevadibazoviga.pdfIn PDF document text
    • http://proxima-design.cz/files/file/nafurixa.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210902215150_a61de3.pdfIn PDF document text
    • https://termofriz.rs/files/64554938212.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/jamafogimemiseda.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/xedoleritokatasib.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/juwodenemipobatexezut.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f203d4706---58624196279.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/datunupugixadekumegiviru.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091115473373499.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/67856272234.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/463473369210693ba664b68d11752e1c/83147880166.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138790b5e395---7663197000.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/39691061021.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/xafadiwinip.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/45049232815.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/90239229347.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/xoranasoxegipo.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/nurofujapatarupilovuveson.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/36452879301.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/13794719238.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210904020303_1779116553.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/46514796084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dream+league+soccer+2019+hack+apk+downloadPDF 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_off0000c252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC252 11512 bytes
SHA-256: e4ae428c82cd03e71184b47e16561e635ac74c1b845e070765d196645c04037e
font_01_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 20804 bytes
SHA-256: 3583315293262b58dc5afc9577aa7789cfbeda461717e26d121cc2273de31c63

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