Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ddfa464ba69030…

MALICIOUS

PDF

83.5 KB Created: 2021-06-25 23:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48780a955c4f725ab091e6d973fff7fc SHA-1: d89962084381c92d2ec3acca09481fd14eed87d4 SHA-256: d7ddfa464ba69030363b366e6255b7d5eb19d39ac051c8f858081542e729e014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://laborke.ru/uplcv?utm_term=les+brown+it%27s+not+over+until+you+win+pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c250929e7bc23725931db9fa43572ad0/685406202.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/a05ok3a1dssbdsrvbf2f7rier4/87172208660.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f522a9b1b---tatojawamozutiwabivutenid.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/v9gavi6h64b2qlq2ils7m0852i/97558074314.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9acb6f3bf---34417891153.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812c8dc3314---55497738060.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/igr2nkma2istqbt12m131kt9ke/kiwuditefoxadi.pdf
    • http://isystem.hu/ckfinder/userfiles/files/71200327048.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e71f8fe93---2837777817.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/balov.pdf
    • http://cukiernia.eu/upload/files/69776308335.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c472dd5f78---debeto.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0bb89815741149d293df07611a071e26/37198462011.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/ei2ii2vqvot4n1qkvoqldgvf4o/75764453871.pdf
    • https://kontiko.com/ktkweb3/images/upload/files/13343654937.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608834a54549d---90795618160.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/80d10ba2dff032e3d20511129330acbc/30828954024.pdf
    • http://omonetach.pl/foto/ilustracje/file/52806403112.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/eaaaefcecdffa075d4fe4ce0026ea350/96409319921.pdf
    • http://bawaconstructions.com/editorData/file/potokazupatif.pdf
    • http://fine-cottage.ru/userfiles/file/21786457948.pdf
    • http://studiocalcinoni.com/userfiles/files/7601535579.pdf
    • 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_off0000e22f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 16792 bytes
font_01_sfnt_off0000fa46.bin
3d552f61a11ca25c77925d74d4f8faed7ac43d6a57fc004c76d8f49c84aead94
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 10828 bytes
font_02_sfnt_off00011343.bin
a2a1ebcb611fc2bd68271597698183993356cb1e72ac5745e8146b096d2e110c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 17280 bytes