Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9101526b65b82b0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 15:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 26cecc4229a8e8743496521f98efb6dc SHA-1: ede069e9144848cdb6b1204bf85921ac0d909f71 SHA-256: b9101526b65b82b0010595c05625022ffa8477cb7435ab15e3a8d165712cf117
196 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of 'LOLBin token sequence in document text' and embedded URLs indicates an attempt to exploit vulnerabilities or trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/43ba077bb008db4ace1b7e58abe9faf4/mijumu.pdf In PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/busuxaromigijetiziwuzur.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afe26aa2c23---nawabufalurisuvotatureso.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/xemen.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/34244296532.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/qnli545o5vdlviprao8lslsoi3/32424590362.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c5d90fbc7e2953af6f6bf9aad2c2e01/32635527551.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/70115679105.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/42369568431.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098ff0b66785---vulikevimabogodokav.pdfIn PDF document text
    • https://timminsrenovations.ca/file/hDa4hkescUo30S5R.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210617_124656.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/0ea3ce7c412fef656a0f83c67353990b/dolutekenupawelid.pdfIn PDF document text
    • http://18554080.com/userfiles/file/19765265655.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd05bb02c---tesidomobazozu.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/85034308211.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fccbc10c---91439346841.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/guzawidemone.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/60091464107.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/mugolovajetufibadozipux.pdfIn PDF document text
    • https://ienter.bg/files/4506095825.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/11105353399.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/82158462276.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed78b8d71---38279234463.pdfIn PDF document text
    • https://diarch.in/WYSIWIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=overlord+novela+ligera+volumen+12+pdfPDF 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_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 10936 bytes
SHA-256: 4a1f5143a9d4fc5c2aac3c80974d5aac959572c22d6ccf20a5ea5e4f0f6f9ff5
font_01_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 19984 bytes
SHA-256: 9a94dec656cfc211801808345dd25de1d16977054d8b4aad3bbf13ae387f3db1
font_02_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1