Malicious PDF — malware analysis report

Static analysis result for SHA-256 beef46c10bdf1805…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 07:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd21602fc27a475f78ceea19d5fb62a1 SHA-1: cb8d24b3dfe5d9a4f0cb1a6648194d0dd62ce5ae SHA-256: beef46c10bdf1805d1c5923f9cb8f65f0e29531a832bf90d03a56af21509f4de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The embedded URLs suggest an attempt to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aspaeng.com/files/image/files/wegiw.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160850f4ab93d5---40176496884.pdf
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/45356201830.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8kib6sabl6g332ta3p8d9540rh/24360530083.pdf
    • http://alexdisinfestazioni.com/userfiles/files/sawofugikepetotexofezene.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3031234246---xogedabiwejis.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a8bd3e8d5b8b203596abb79140bc1f3d/28877673346.pdf
    • https://jamurgoreng.net/contents//files/sevagakuwopemawewabiruf.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/0fjbv8fvgobj6f7n0as7g8t3uc/71848769383.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/66a7f8dc59f934eed14b56ca4e4e0f18/lutara.pdf
    • http://4bx.pl/public/file/90639788148.pdf
    • http://stjconsulting.it/userfiles/files/galugitanawobemuwokevowa.pdf
    • https://oteaexpert.fr/cite_imgs/file/46355207497.pdf
    • http://eko-inwest.eu/upload/file/jexujukamofaxefot.pdf
    • https://mmszke.hu/files/file/gupadesipabede.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b0b7d6236---76988604897.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a1979a7390b---bugigevatikuforu.pdf
    • http://dragonera.cn/admin/userfiles/file/57761235453.pdf
    • http://promocode.lu/userfiles/files/kexemunufazobimigiz.pdf
    • http://dblbtech.com/userfiles/file/lipavekujalumot.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8fb23e442e6d91842713f489f24346b3/36105803124.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vg1gj93ab0qv7ooqejurufkkr5/diliwifovobuze.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8386f9a79e---95324427153.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b134a94ce---vonewevasopelipusipezo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=engineering+paper+goodnotes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e991.bin
1bc498232a5ff213011c21d384cbeb006e0c239720b5c739947e1b1b57a1c22a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 17304 bytes
font_01_sfnt_off000116ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 16792 bytes
font_02_sfnt_off00012ec4.bin
a49bf3df5aff180f130f58606f5602aee1af3d553d6d29a008259f19d9445c9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC4 10504 bytes