Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f42aa183255a57…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 13:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 118105c30f46bac7d3d1df43faaa69c2 SHA-1: 810b093d24bf93c8477433f05472a60028d400df SHA-256: a9f42aa183255a57b22d1f0ed3a983028d89a07ce262cd6082725f4ebf59379a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users. Heuristic analysis and ClamAV detection strongly suggest this PDF is a phishing trojan. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xudufifagolimazeladumabed.pdf In PDF document text
    • https://maritime-models.com/userfiles/file/xolidivulidoluli.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/14748749458.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410d60926ff---patabifenuxajilog.pdfIn PDF document text
    • http://ud2-140.com/files/6001651662.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/vapipan.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/82a3397935abad77c18cf668195f193e/tisimutitonujepol.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/55961837290.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/13371884969.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/65376926797.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/dojolatipiluw.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/miduvivoketozo.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/jemazoverabalerijojuxaze.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ff2574fe2c6271ed38bccc01e447058/vuforujajekisigugovotuzer.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/5133838393.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210911_D66992999E45500B.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/52003191159.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rifejifumawazisobi.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/94375425522.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/75383225665.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/gemiviwekip.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/69524816411.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/87065003543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+cricket+streaming+websitesPDF 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_off0000de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 10704 bytes
SHA-256: db5a681b776d67aa268042e11d3574966541e16a53df1a5ff9b220056f9cb44d
font_02_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 17448 bytes
SHA-256: 4870d5c1a9b1b8d15c97d04a59f1ff809fa84911ba4308f61db352772b4739f1