Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f10754f23a5d96c…

MALICIOUS

PDF

94.6 KB Created: 2021-07-06 09:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f5fc5ab07ecb06ad70ecac09890580f SHA-1: 5c14f89f4b325b70964a10e60baf649dae759692 SHA-256: 5f10754f23a5d96cb9565df18c2309f89a28391c4d641fc00b55eb7e8817bf0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://hayatteknoloji.com/webimage/file/davopuwikuzixazi.pdf In PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/1bcc395616ff7cd77a6c688221254946/roluvamili.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7302a510c3---71937882778.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/r4mfb5na9p690gv9trtsbu2c8u/70009742418.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e6ae55ba11840e4b6ea0ce11114ccc4d/39177396128.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/19812901073.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/8548253156.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/jiguna.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810f373437e---suxuv.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f03bfa14ab---94518519729.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/metunelo.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/22971091645.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e277ae8331---27165714106.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/kidulovedipo.pdfIn PDF document text
    • https://777mto.org/contents//files/butolajuriposemaxomik.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/42285880262.pdfIn PDF document text
    • https://argumentua.com/i/file/sotanimus.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3f73b96684e35bc340256e1417115c57/50198654971.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/nufuwudubemako.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/rixonuxajatavinugofo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48e614b5e---vinofabarefok.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wekafedasuzol.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9f6c7d415cbeb681a52145fd15f2bc98/jofusutepoliporeveza.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3f81c36ae21ecad282bbdd1d080255d0/6872601694.pdfIn PDF document text
    • https://ecoretras.com/file/zedisetadomesorubitujibe.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915dbd61ab3---bukefaximega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+rime+of+ancient+mariner+is+aboutPDF 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_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 17580 bytes
SHA-256: eef8f9e9077442f47864bb9a95a25a5c952768c5fafe3819f1a9bd04017b5a69
font_01_sfnt_off00013d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15536 10756 bytes
SHA-256: deba15851fdc21557de690a2156b04642ff10e4da70afb2737fa0e5bcac59da2