Malicious PDF — malware analysis report

Static analysis result for SHA-256 810f5491a4088fb0…

MALICIOUS

PDF

84.0 KB Created: 2021-07-08 06:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34bccbf8cdc38ca63ae7113365a60c41 SHA-1: a5d1fff6a7fa1c5d77d62af03dc242f6c3971468 SHA-256: 810f5491a4088fb0fe314046b3cc93ac799d9e13a354166981b89bc9bbfad619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with multiple heuristics indicating its suspicious nature. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through the linked compromised websites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=manufactured+home+framing PDF link annotation
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7a1202cfdb55b1c27812857547d73332/xuzusugojikomuwadu.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/1757520600.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aa7bd91e8---jewegadinigemo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb387eaf05---6021065000.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/828135030f29239c98407602d3b06c7d/66438028725.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lda0gpif4e9r86fc0vqntpm854/xawif.pdfIn PDF document text
    • http://turnyras.lt/Files/file/pobinutotobetatefiva.pdfIn PDF document text
    • http://chpcentre.com/files/file/15972710627.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/49149011820.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096adaf14566---ladigerolo.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/mofadofuwutep.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4963760b4---84774942360.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/859cd74f0163074d471cb648b3a21921/selalufemixarus.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/tefusutixilu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec7ed018ab76546691f103794065aa27/44926999511.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/7100813687.pdfIn PDF document text
    • http://novichiha.ru/pic/file/75753738343.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/31212275851.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/bozovezifajotane.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e22cb8d4521a8957858686dee5641032/24151827691.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_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 10800 bytes
SHA-256: 4b38a920283c10fc6e0fe8f65d0419e5a989e929dbefc7c814cd89730629032e
font_01_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 16812 bytes
SHA-256: 27e08e105dc03c5e73df82e31dc04e8c7cd65d4d6a8d5ca6ca67121f64878e86
font_02_sfnt_off00012b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1