Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59a6adc6c71be8d…

MALICIOUS

PDF

80.2 KB Created: 2021-07-13 10:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39f169947e4489dc3f26241358c53606 SHA-1: f74474fe179261a3a65d3645fa1a41702c732303 SHA-256: a59a6adc6c71be8db8ca180dce5e35ee05b397f92448b9b680ccea4f1a885980
156 Risk Score

Malware Insights

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

The PDF file 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 WordPress upload directories and disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mamo-tato.ro/userfiles/file/lemafovefojapidunexu.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/5cf59ffca3e69191381c45ac6c2c7d69/4253001521.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59126bd8d---63566414232.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6b00e8d29f3a95c45e87bb58e15b855f/jororerididoke.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/lotexek.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/buzoxumagepujawiriwawuxiz.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b88cab3f78---jawilitinozutaki.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5a77d6bbba9c53c8936f8592c688e9f8/60442387621.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jvbbphbdvp9lbdd1mv5191nu91/49152182710.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989fb21e78e---15103440751.pdf
    • https://moveo-sport.pl/userfiles/file/tatomoj.pdf
    • http://cropscipublisher.com/files/upfiles/file/pobavepazuvis.pdf
    • http://aexpress.lv/index/images/up/file/87204395923.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/muxopiwijope.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/jojugezowawamubizexapuw.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/ac811ba53a8b2a94f25a77f55dee4694/gubagewujukonumaxukud.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bsbdquulopeosg3kvdq3mjge3q/44106729587.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ecb8081ee8ae57b7aed182738d0bd2c9/16097819967.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/us3ql7m34kg18viiokrls2252o/doxedowosizew.pdf
    • http://mamnonlittlesun.com/upload/files/40069626904.pdf
    • https://fullgame.hu/uploads/files/xisazeren.pdf
    • http://vietthanhstone.com/images/news/file/lifugesejubatofadevebut.pdf
    • http://calhi1977.com/clients/879053/File/28098581841.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607517721fca7---xilexugegado.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/xamizogomalekikikovaxojuj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ultimate+four+arms
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d958.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 16792 bytes
font_01_sfnt_off0000f16f.bin
fb98c8e3b3fe27701eaf2060add19bc8271d3d0e0d099e2240dd3d77c348d50c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 10380 bytes
font_02_sfnt_off000108ea.bin
415388ed3526d8183c5b4413192732dcd4cbe92142e9768e5b3e1f541b4a586e
pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 16420 bytes