Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f621a856b16a2b…

MALICIOUS

PDF

102.5 KB Created: 2021-07-21 20:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f193b5bc972f67ffdd520a81682a22ee SHA-1: d36fe31c42987fd2144b2664ba1995a619a68dc8 SHA-256: a1f621a856b16a2b696089125bbc3f6b2d44f8fceb8dcd022df668932389d3a6
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting further PDF files. This suggests a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/1j075b0lsu9bdmusuo1dgnuj43/juvux.pdf In PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/469b068d3a65f34079cd632c3a13bb08/39698721154.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hqithqnbggtupl645tu4vamoe0/fopixof.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5a8d1a17f7bc15c6d2795d0fae96af5c/33564860126.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/29416328890.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160744280da0da---rufowojifebemumanapafose.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e448398207c---5588839913.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54e1b222fd---feten.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/tadinivarasinugaguf.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/monizutamenabije.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/45916844748.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/8b596633d512f054c366e1413cff26a7/vorisanisudotexagiruludu.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210721_222311_143.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/3726607943.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8db16d83---logopubomivigufosepipot.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/situfiguvorepodemos.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160834ecb6086f---91641508746.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609457309ce91---xefiximavivowifave.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/n2mje1dv19d0j88s9s6lee8bmp/46292108077.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/75547958560.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/pobosawusupimutufixabixoz.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d214684480---basakun.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16081d271b794f---wifidiguloxofozawazuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=labyrinth+of+emptinessPDF 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_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 17444 bytes
SHA-256: 7f34bac0a29a36700b2724de8431e62183080b96ef9486216606b6bb03e9b866
font_01_sfnt_off00015bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000173cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173CC 10788 bytes
SHA-256: f774611b0c91253fc4de5979ba334a56d83bc06c97c29c07f55494e00c5a2569

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