Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af260985aae713f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 19:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3e112e1ae23357f02783f331eb5498b7 SHA-1: 4257056f2c888f1a61704790c318ec0a8f5768d4 SHA-256: 3af260985aae713f4bcb27fe5f2af3bb5959131b270fc0fc7c8421fc70850c27
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack pattern involves exploiting user trust through a link farm to facilitate the download of secondary payloads.

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 http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45ef3cfd9---levomepoduw.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cbbf5a85a9a2ee1dd193481c72d44d08/53433088121.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989fa93358f---fivijozesowo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848dc4b9e89---22774331591.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/zuwaxufafe.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/kn44h62gh7uq6hcfqnrf8rl6s5/38142279539.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/35084477564.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/97390528316.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2882d101de---35066987730.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/dieot8u7c0l8t56ma9q4teujnm/gakixudefezonedonesu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cb756fd1f---51227690224.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607658bb5bfd0---wimiwoza.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6fd8a9014---xajupunisokufodavunofogag.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202152918204.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/lusofugaxalav.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/15517990805.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a7dc3372---wemovamuwiw.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f71a5bc6---39457988167.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/51439068814.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/figolutazupexudosogivirub.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9066600cb---47661197321.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/88684280080.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/tidokusis.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/sularexixijunemefuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tiger+woods+mom+namePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd7ddf0a12---bomizarisino.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_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 10496 bytes
SHA-256: eb8a707fa7d0ac36f60bed62ccd091040fb65beed3cd47001c8501c6bf94da5c
font_01_sfnt_off0000eb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 18180 bytes
SHA-256: 7a42760087a2333a598023d7db79c574aa0e74a6aae16991103557f30386d038
font_02_sfnt_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1