Malicious PDF — malware analysis report

Static analysis result for SHA-256 06326650f3b4f15b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 18:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4bf6b181618e5f7844b9af251642162d SHA-1: 4a2e23a10b0a67ef8ed20315f58efbe36d258dde SHA-256: 06326650f3b4f15ba48e552220e72f70949e0db3a3b69d525663770184e35f58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to trick users into visiting potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://anup.bo/images/files/jevofilolonadobuboje.pdf In PDF document text
    • http://espicycooking.com/files/file///neworomoboruwibisij.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/98397360968.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/22605028308.pdfIn PDF document text
    • https://rafautama.com/uploads/file/39229483931.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/35027898431ed383bad8079c3810590f/jubabobodinub.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/rasugarufixiwomebogo.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/89921280521.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/zigejovevivobiwu.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/43737365858.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6g2qhttpukt4a6o5pbp554fggn/67406980778.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/44155610207.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/funutejafefaxufipudi.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/52984718367.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd52cd14d4---50159536965.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/94883602644.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/47577338109.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/6615480283.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/24842551998.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/23833981507.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/96870930153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+app+to+see+who+views+your+instagram+profilePDF 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_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 11224 bytes
SHA-256: d4f4b5d28abcdb9337532bbcb514e5b4279e2a9deab230b300311ad8735b6b29
font_01_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 17424 bytes
SHA-256: b40f129a53ea2922486beaec9852b13f147be0395968843ad466293f7f32523c
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1