Malicious PDF — malware analysis report

Static analysis result for SHA-256 998a5a25f5f8d85c…

MALICIOUS

PDF

91.5 KB Created: 2021-07-22 20:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bed38fc6927533c745d07fc456009651 SHA-1: 6dc517adf37d518b94335bee3ffef89cbbd03969 SHA-256: 998a5a25f5f8d85c79fd37814ee0af523db0e432439b036355bfffe752ce1148
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/jqn1a3aae4326h1oh77p6q8eri/51502608516.pdf In PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/poxizujibapejuzikufewebi.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/demamagaravomijujuzokenat.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///95372697138.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tunnha5g4hgd0gd9ha0tv6nbcu/nevetinazedakufupagaz.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b162475f7cc---bomefez.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/19494749174.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/53590786584.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/48635103503.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/20c27baad72e44b0e6462c3101cea513/fedib.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/kamolafumakexixerakodan.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d877e6758---lonulularizeravofebobagam.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843a8c764d6---4271278940.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/53552821040.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8c974734a8d9656023b11810050ad578/jusimelulalanu.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/94642679840.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a15101b297e6716c25455c0fc42eff8d/zaporexusaf.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afe372cfb58---gepive.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/godopuxunuboruxu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/11430963166.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99c77987d3---75649508909.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/sisojipudobatasujudirejab.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/dumidefodivixovisu.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/26816477564.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794aed03e16---64816492095.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca0c564b19---segimevofawanuwada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=foods+to+reduce+triglyceridesPDF 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_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 17104 bytes
SHA-256: b7c1a1ad0eab10f19c64def59af08c269560deb2b3b9445549301437e057b42b
font_01_sfnt_off0001303c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303C 10468 bytes
SHA-256: 40357c1ad2765e836ea1b1f243800dfae312e77cb65d9d9655c4416cb6d53650
font_02_sfnt_off000147ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1