Malicious PDF — malware analysis report

Static analysis result for SHA-256 7286fdef2f6080a9…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 07:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c14264dc747172254048712433783aee SHA-1: d4984d93347f75c45624c4be4a322c274f5fc4bc SHA-256: 7286fdef2f6080a9d4707c5ba89b8bb53c5bf1553e8af18271de77dae9713625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=auto+send+text+message+android PDF link annotation
    • http://fruitvita.com/files/files/bedaluxurixaporepisulu.pdfIn PDF document text
    • http://letdentalab.com/img/files/49812135047.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/nutonopoze.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/83032608906.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/346703856.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/vamedew.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/15592647471.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109091653365106.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/logazuxupabive.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/felezaxa.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/lerokogemozavanesozerimi.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/99455050163.pdfIn PDF document text
    • http://labotinnghia.com/img/files/12617276086.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/68psajvqsr3u6qaaj8kvk43pa9/tutoxawuw.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/rojofomafa.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4c6ea96e---65532414675.pdfIn PDF document text
    • https://camphacement.vn/upload/files/jibukolokiva.pdfIn PDF document text
    • http://sun-tes.ru/files/file/8355540313.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/batobebemisotejaf.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zenijenodadegipexura.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bajugulowezekubuleluzuz.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/89397719306.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/vodunojaredexariwu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3hu89npa51hg12b2ca2biuo2rs/mowebibi.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_off0000b1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D4 15128 bytes
SHA-256: 0d486e8d1906030f3bd209adc17b7d2c1db1f0e9a6e6ce9ac9d8a65af04b6683
font_01_sfnt_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 10728 bytes
SHA-256: e184af945333ec73eb7a9077675bc8a7fd81a3f1bf44db32f9fa0941e3b6160f
font_02_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1