Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a572f4923926723…

MALICIOUS

PDF

76.7 KB Created: 2021-10-04 12:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01189ff100934731325201e8148da86b SHA-1: 51c04d73fc5303d178f4282784c7b94cb710e7b1 SHA-256: 6a572f4923926723104dfa66b66dbba8d5ab01755967c81ee5e0b2ebdac58dc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true malicious destination. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://oniceh.ru/uplcv?utm_term=62+f+to+c PDF link annotation
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0a651e742b6cb5a47a19ca438433e1a2/xetalunuxudalaxadoxarifo.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/kijamolazogu.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/vixibunolelun.pdfIn PDF document text
    • https://isleo.com/i_photos/file/95554027262.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/93679561377.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/gozamiweput.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/lixupumokigupovinidiwaled.pdfIn PDF document text
    • http://cartopack.com/Images/file/63209307144.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/gajejaj.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a7fcbb4c---wovikiguxejaviselanawof.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210910074659.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/ropixalegajugarorivizoru.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/basagivijalo.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/pipopewu.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/duxadavo.pdfIn PDF document text
    • https://hiroyoung.com/data/files/wegetokizegus.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/70899017509.pdfIn PDF document text
    • https://limsurempat.com/contents/files/kepepametovidupivu.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/kesetibiwurebij.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4262d74c---65567218655.pdfIn PDF document text
    • http://rayanchem.com/d/files/27534892948.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/duvuranawediteg.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210921111455.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/37221929022.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/71968852717.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_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 17900 bytes
SHA-256: 015a2bb24aa409cd89d0f4bd00239ded3a2bccb24297fba77501de0a0545d6a8
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 9716 bytes
SHA-256: 4145f40ee74343888d398988e36b862c40069dfbba7cffa3669fdfa8848919a5
font_02_sfnt_off00010d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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