Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8a90b704c9d65b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 19:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aae25aa874bf092f5b7dc35c75d406e6 SHA-1: 8461cc038ca68625e2398eb447e73d47bf4cf408 SHA-256: 2e8a90b704c9d65be0ebd56398e097d67edde2e59914e1698f8ca4097dde04a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=bt+mail+uk PDF link annotation
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f15d4bbd568dafb59410a2fdc6b7cace/meris.pdfIn PDF document text
    • https://biodez.lt/i/File/87026578920.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/dumipafiruwagugezo.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/dotixavuriwanekuva.pdfIn PDF document text
    • http://ctm.it/userfiles/file/44301056999.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/teselirolutonujozimubofo.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/werexusuro.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/9675225108.pdfIn PDF document text
    • https://mahae.hu/files/files/taboxulukaruzibamusez.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/9057404724.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/96320299864.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/fozojamopasupuwenew.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3gchn08qm0n3vbqoj3f9up99qu/kujoxad.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/solopexujurojaposoma.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/78615291733.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/96706743015.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7oia61end5obl4f0kojq9d7174/93111609168.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/witopezob.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/96300726309.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiwuridenokunajupulo.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/96156263902.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/fonujedivoke.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/rafulifapilagofe.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/kabopiputezulolukux.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/49838172269.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_off0000bbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB0 18368 bytes
SHA-256: 49fc0f71059b81610188298f7a076356a7cf8d63e284457c9a05438ee188c203
font_01_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 9892 bytes
SHA-256: 2a3f043aa86515b677b1e3c84fc3d33eb86a373379d7a0c01bef308a4df3f3b6
font_02_sfnt_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1