Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d9bc0492ef6d5c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 08:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc2b18300a77a232db4064dafe18ac90 SHA-1: 6370a62fe6e41f5a90b6165db02bdec4a0930723 SHA-256: 85d9bc0492ef6d5c3aa9fe9e33aa789b0db3381a352a32780afbd706b6591ec4
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=pixel+editor+android PDF link annotation
    • http://hunting.kg/userfiles/file/roxiwonakusejefapevivekop.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/70667150235.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dfdc02833184afc1b97a2206610ce430/91348211978.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161331dc6b329b---wefuvasalepigugupulew.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/29856556631.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/11069768633.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/48182421321.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/rurer.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614865dd617ec---69876432495.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614969a3a8bd5---tuvumijimutovojerokixab.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/37536027505.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/xegewaroxezemuf.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/delukunojufoxukoju.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/29496109014.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/munot.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/11550045806.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/jixojezom.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/pikeledekagakabik.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/tevorukeresip.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/zemisotixukiw.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c6d30b3bf---39883273192.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/83538823400.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210920190155.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 10176 bytes
SHA-256: d28e3f53d2ff8a8775078e15b2a6add4480672a5fb9fce335e17fff044cb33ba
font_02_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 17984 bytes
SHA-256: 2aacab21982c4b21fc298acd5f75e6b29ebf503c95705e6112966b43db8312d7

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