Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9ec25ccf5d6195…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 00:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35abd40ff918fb5bc4a111ef9b3e8d63 SHA-1: 48b6a3587bf7ed6c69b56812115780ca655634b6 SHA-256: 7e9ec25ccf5d61951d9d09cc8cacce47e910e7810c8e6cf1b4561e4f724e1ef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the nature of the links and the detection suggest the PDF is designed to exploit users by leading them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c773c10c391---91507336832.pdf
    • https://africanresearchcenter.com/userfiles/file/kegukoximiziku.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/jukijedajogajo.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/q8etqirl3mt3l5o08g5reo2437/nipebitufuladefegovudi.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072628eb56ca---tunibozukebeda.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/20d22639fee216b689d8edcc12715d4c/1205948127.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099f20b544fa---meduti.pdf
    • https://die-elke.de/cms/elke_page_files/file/jutazujuxaka.pdf
    • http://bainihu.com/upfiles/editor/files/vusedorexosefopobu.pdf
    • http://t-p-fortune.com/userfiles/file/wasimexifarufezubep.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/39143927238.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/gs3glls9eo4q5cm6ttqhirn9ci/79560301041.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8fd65bf2129dc09fca9b4d2e430764b8/pemawexovo.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb68ceb7d---8875853217.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae6f331528---87965193936.pdf
    • http://toshiteriyakiburien.com/uploads/files/xelumepikezex.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9b756fe157f450af306cad852ecd47a7/16078600507.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/62927520778.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64ddea045e---30406503866.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cf722d7fc2da541d838bf520bc5e729/95456041035.pdf
    • https://securityguardsupply.org/php/uploads/file/gidamoxoseluluzip.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/99c457fa23be474c89b05c1253d1b735/pulelajedeloj.pdf
    • http://librojuridico.com/aym_images/files/kasufoxokukazonilusavawu.pdf
    • http://kameleonhastanc.hu/files/file/42396894982.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607283b6bf379---93678399041.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8mc57g2uuj2rlfhas8pjq9pt8f/49434759035.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=power+of+thoughts+stories
    • 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_off0000f3ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 16792 bytes
font_01_sfnt_off00010bbe.bin
dd815d43aac5bb479dca63e9a82f77d3345ba39eca91c34c2ae85e98a808e370
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 17124 bytes
font_02_sfnt_off000137d2.bin
fdae1c93c44479632f48de2909db1c47d7e36efdc727b29da149e3cb38274081
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D2 10368 bytes