Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b927c95288a5702…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 15:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8609e5426452ceb1df1e8db089c363a SHA-1: 369672e260297cef885da517149325cb5fa5d262 SHA-256: 8b927c95288a57026278660d203c68403be72b7df1ff36c8837b3cb8568cf73f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://reitinguok.lt/userfiles/file/14710794378.pdf In PDF document text
    • https://solidpractise.com/files/userfiles/file/vaguvudisotagisimaveja.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/40697209504.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502125559276918.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078286de9a44---nawugatubudufuvogubij.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ab3c4209c305fd8812be3f69b0b77d7f/54499347034.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/likiwepakavep.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/17c3eb430288a48ac7682a84a7c6051a/6133072607.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84618f0a9bcd179d8e3423a8ca57efc9/robakatogo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/03o14mgidr069ub1adh531bnpq/31806358378.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/20119687364.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/54055399943.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/78885340768.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/41913785301.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/9670223172.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/52452843702.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/49619470721.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/62712687330.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/wujowenudimerajo.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/besejupug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=lg+oled65c8+user+manualPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/348cdcc5736364a198835bc673509f02/jewupobevenadi.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_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 11092 bytes
SHA-256: 9984a264dd53f379938d402a75ad280e912838ce8607f9bd66cac76b9a6ee7e2
font_01_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 17196 bytes
SHA-256: 277b518d3a6c50ff989d8b61b35174c96e5f3acd3d1716bbc6ace2b773128442
font_02_sfnt_off00011d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1