Malicious PDF — malware analysis report

Static analysis result for SHA-256 260015525df5b9ac…

MALICIOUS

PDF

71.7 KB Created: 2021-06-14 04:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e7b6b1a3a9d233f9148ccc312fa90b2f SHA-1: 8a1ef6ceab74f1ef71b527fa599aeec423aab6de SHA-256: 260015525df5b9acc1b17dec8e9d2444412eeac82fed9415f91d10e88a636617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=2nd+puc+economics+book PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/hk2kdphps6u6844tflt7j1of3e/wigotaxikimemubipibozeg.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab89b88f03---5139571511.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ec73ee9e4b60958f34e88ad1af7eb009/sabakosesirififisuvefoz.pdfIn PDF document text
    • https://aashianarealty.com/file/norutimet.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/4b847a397570a04f48b39b76ae71f319/2056320823.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40970ef44---77841901799.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5c9403c56cd86df0da98954dfaaafbb6/dawejibakulopewekijonepij.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/zodajaxutumegiwonafofidi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a84fabfbf---48819743053.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/4gkqrr617miad05k8nb73vf062/58813044312.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/vco1es08velhohqj41mmuegn7n/32464533868.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/nalutefawimuxupepi.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/fujixagu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab62d0f331b---29212168497.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/danofixofirate.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/20802963164.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 5120 bytes
SHA-256: 72c15691e5a8884073d8c4480b0e5c41b1dd24c52474ea26231a2276fa95570a
font_01_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 10708 bytes
SHA-256: d29d1294713c9364af0e62c364cffee48129a1030e981e06314eaea1515dc2de