Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f151686ac04f6e…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 17:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9e2571d4ee912420618b9275959aa42 SHA-1: bc51ef2a6f764aabd99f75d4629c3515e8b68028 SHA-256: 07f151686ac04f6ef77aff5d50bf8c5cd7b5cc0048feafb016b53508ed001e75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://beloezoloto.ru/userfiles/file/pusimugikufedajibimuto.pdf In PDF document text
    • http://spalovnachemolak.sk/userfiles/file/dodiwetonapoxapazalemo.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/90534943279.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a9d09f762511e400b813696ecc0ebe68/54793664316.pdfIn PDF document text
    • http://dsagco.com/Upload/file/27524655225.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/dojatumiramugamorajisutul.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/vijipeximujivisorikir.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/79301094685.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/45284645587.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/ridevakotonoroge.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613941aef0f51---xuguriw.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/32435292127.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/pimedidedobizusuwozezu.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210911_966B96CD69E0EA85.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/26617241874.pdfIn PDF document text
    • http://keramann.ru/uploads/files/zibobisalopevegujomuwizo.pdfIn PDF document text
    • http://lukinserv.hu/file/3064603526.pdfIn PDF document text
    • https://umutfm.com/resimler/files/45945774734.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/xixoridivaloju.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/85902496889.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f293b6d54---12454972593.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/pulogotabijofivuvun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+find+the+turning+point+of+a+quadraticPDF 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_off0000b920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB920 17028 bytes
SHA-256: f88a706a8eef32e0c678df64b7430482aa0263319cb64eccaf1f0c3b137629bf
font_01_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 11008 bytes
SHA-256: 1b0ae0a8b363f893c61070be17facfc900bb8df5e86a345d05fce190d944c301