Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b953928e13c08ef…

MALICIOUS

PDF

84.2 KB Created: 2021-10-11 06:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 12e6e341f231555278f3fdc1718f122e SHA-1: fd241bf4e27a13978c288eadfebcff1d3501e8f7 SHA-256: 8b953928e13c08ef6f5fe845fb43daa340f6abfaa014a404d5df0627c7880b71
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://t-eamplus.de/web/editor/files/75999229731.pdf In PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/lazoridorabuwiwezunoxojin.pdfIn PDF document text
    • https://aaaxxion.info/images/file/84751044810.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/58718978145.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/kurunaxifevuzujak.pdfIn PDF document text
    • http://kco.su/userfiles/file/43431073567.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/laxixox.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed64d460d0---litejewiz.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/94014610622.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/donivevaratafip.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/be3460c16d7285340b087f9c1f8e64ba/18537794334.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f3384c0c2c17893440e6980dbafff442/45630003444.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/f4debdd74ff6f2f77166302b294d4eff/60289771887.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/47138097129.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/82912697634.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/kadibaxevozimovegisetaba.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/46a696cbbf91426389b2ee09b2d50b93/nodalaxevexakugimuku.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615f14542e4ec---39505810220.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/76452571617.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/23497e8420499cced854d324d5863b64/15136552144.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/bixasowobipatupitogeledoz.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/16b39cd3c906196e5faac80f21fd390b/43810737173.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/dokimexamusafogesi.pdfIn PDF document text
    • http://k1a.ru/images/files/file/82289046922.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/nigonatotir.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7e5a36ad36c463bcdb97e6fd690d3554/niwolabizamofegekixomor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+get+free+tiktok+followers+without+human+verificationPDF 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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 11116 bytes
SHA-256: 7e77728924949a0a422ab36783eee076d85b3add7a8a4227f0bb070b965d36b8
font_01_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 20512 bytes
SHA-256: e13c1e590e83a7e5822d0f3f87369fb436301690ea449697f5fc1f2ea5bbd972
font_02_sfnt_off00012ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1