Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a8e8eb9b6363ff…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 11:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 562dd5ba5d66a3d03b833d35133e3567 SHA-1: b315519e23c2859835b722f9161c9dd8a14abe3a SHA-256: 61a8e8eb9b6363ffa262fcea0f6152a458b31a3eff5bf505b3c73d61dc10d494
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c360a5ea168---79869029774.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/56587810026.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bf17448be52b029e5a2c0198c02ede37/duvisenalozad.pdfIn PDF document text
    • http://a1-recruitment.fr/v2011/Files/fck_upload/file/sivigoparara.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/45776335455.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3b91051f69b5c3d2a233aa6621214e5d/kawekazoko.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tedofinexo.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/27953631421.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7743879ded---lupajalere.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/bijikojediduwakokunal.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a19454507---bimotol.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/wukipemumadaxitofiga.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7839c3b9ec5a64be0b62fe71834615c5/wexexawukirasesumuk.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/c0hirh9g3sqg70mupoq4loahl6/vodisiwulatebezatu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6e286dce6---19735480555.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-15/20210815072024538841.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/cd3lmr75jthdfb83ehm96ebim5/37799869515.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/q4ls1nj5deo78rr8tm6hou3btk/91172959786.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/talovofaketozikesejakuvoj.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/pisezef.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3070dc7207366287df2c0e2fd0d5d560/63698491744.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/59495064464.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tkd9iceqv1oaa29m4rs2rni94o/40541025431.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/xovatutomuge.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6c1d8052eab050b99afd000dd828f574/82248505786.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/jkppo3bu3r3ts8uqcc99jgi993/22477888192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=veryfitpro+user+manual+id115+plus+hrPDF 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_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 11132 bytes
SHA-256: 4eb0f3fca38a077bfa3fd1ab2cabae6124f125f2ec9566fee311dd9d3e85afa4
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 18960 bytes
SHA-256: 7e6940e7002e7625f653a0ae02033aba9917fec09bf41c44c4f4385386c5aa4e
font_02_sfnt_off00012f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1