Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcf39e215e5b366…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 10:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60d444c5c6b1eba48f4d94bfd7a69cfa SHA-1: fae69aa34757c9c996e9ac187eea0a0c4a8d2929 SHA-256: 4dcf39e215e5b3665fdfcabd3bb61f76b4961db8c84daadc4a875e35238b044d
196 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The document body is heavily obfuscated, preventing analysis of specific content, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://charmingcurls.se/upload/file/nosilepefal.pdf In PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ef9131c1f22989ef3a088277055053d1/94233307005.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e8f786709d3470399308a385b143f5b5/19843320406.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/maripaguterevizotudez.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161316be13904d---53202302642.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16134cc87c713d---60743361091.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/64001160140.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/xibel.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d14619584---40364130305.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/dadilusinolu.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/56370201519.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/lasopumomizajisevoneneg.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/36375169551.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/zosopuxipara.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/futawubupopewow.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/xadinutixomopivefud.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/fuvulusirulibasuxoteva.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/674ad74a5628110348eac41b53966745/sitokizadaji.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/85328725092.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/xoxobuzobabaxozarupudo.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/julerujod.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_E8949F6D2DCEBA0A.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/likil.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/11002590124.pdfIn PDF document text
    • http://it-hair.com/userfiles/dugukubejawofanolesi.pdfIn PDF document text
    • https://bykevin.com/wp-In macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dna+codon+tablePDF 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_off0000b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 10144 bytes
SHA-256: 635f03f75f443c954c4939d73718a7bece3da67ddd821ab4af51d911490b5612
font_02_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 14380 bytes
SHA-256: 612b1d72348fa0b52771bc5af96bda136d383a98de18bbaa889df077e3517d25

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