Malicious PDF — malware analysis report

Static analysis result for SHA-256 4172d4d4743cf9f7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-22 09:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a2f61207a5840f08798d0bac119d123 SHA-1: 16be1049bdf5e14dde04cd5a4d994569cb7ed15f SHA-256: 4172d4d4743cf9f7893353bae3fc5b069a953815d26c82183ae9715e0e274d68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=monopoly+game+download+for+android PDF link annotation
    • http://tucholainfo.pl/userfiles/file/67240970535.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/lulefuxikawuzafu.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/nogumabefine.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/muregogejo.pdfIn PDF document text
    • http://parentini.it/userfiles/files/toraposowopulizegim.pdfIn PDF document text
    • https://jurad.eu/files/file/tetotetozotebaki.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/fexixirorekibaditijibu.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/gokekisa.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cf74b0ac12117a52e3715318bcaa9be5/pawer.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/vajowitixapuregutat.pdfIn PDF document text
    • http://gr-chem.com/upload/files/xuxajoraledozupegekova.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/74158415097.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/27530827934.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d470bcb5b7e0e439dfa5d6bb31b9dbcc/wukowe.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/69390402715.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/gazejujewoxepopipix.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f807e3cfc5---16385435331.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/fomabez.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/roronaxebakamav.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/67738732043.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/3315413371.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/14192283317.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/59815735901.pdfIn PDF document text
    • http://tianfonmm.com/d/files/nexovozulin.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/gaferumupaguvazeso.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_off0000b4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F6 10768 bytes
SHA-256: 887ba842b86a8e87ff4d2c963234a6e4d4ee3934cc0df78b66d8eb11969ff94d
font_01_sfnt_off0000cd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 15136 bytes
SHA-256: 5bd2ddf2711ab7063aa5de80a44df1d7eec6e111aa63626c1bc06681c563afe4
font_02_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1