Malicious PDF — malware analysis report

Static analysis result for SHA-256 810d44cd7e259f14…

MALICIOUS

PDF

88.3 KB Created: 2021-06-25 20:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efac479cd69e32c2b476fbed0cbc6776 SHA-1: a19a3345154fa3a0edcbee5f1cdee805baf0ae52 SHA-256: 810d44cd7e259f145f0af87a9f02439388042a9e1a0a0a63bcf52fb178a7d508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised WordPress sites hosting similar PDF files. The presence of a 'utm_term' parameter in one URL suggests a phishing lure, likely attempting to trick users into downloading the file by promising game-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd850ca35---12228534009.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e71c75b8f---parisubirojogozixo.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9df3a6a0815c44aa05a720f7f03956a3/34765013548.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea04d03ae4---55182697997.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a40507218---47856292623.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58303a2c4d---vuxibuvudobelunizakejek.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a0ac325a7---somotivejotesigatatozifup.pdf
    • http://safeabortionnepal.com/userfiles/file/47033124622.pdf
    • http://andlupa.com/userfiles/file/6611386074.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2a56b6c1c106d855dac69e647d7a05f8/wefabukewinuviban.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/94404237.pdf
    • http://houstontca.org/Content/uploads/files/24017386280.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b73008c309c---49975691415.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450dca167f---kezixegas.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210625070638.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089705797d81---fodofaxudafupifezibeje.pdf
    • https://hospvetcentral.pt/site/upload/file/tameliriraworevugut.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b23c44135a73a7ba7b03f4d3628c09f9/59899200814.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/r6vje014928keeqp9gaevrkkim/28785335875.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/76971244407.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7dff32958a23d7a4deb5ab5489274d8a/jopovogatinin.pdf
    • http://didula.com/img/file/legibod.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ddbf14faf365c306c607904b672e395e/57920980339.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f8006ecb0918bd91b640fc3a2427341d/nanokilunixoko.pdf
    • https://naoshima-habitant.com/73149127195.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gta+vice+city+new+version+download
    • 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_off0000f50d.bin
c1ed4933967902e98401c3dbff5af7e16713ada1cbf38182d3195ffecb0c429c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 10668 bytes
font_01_sfnt_off00010dc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 16792 bytes
font_02_sfnt_off000125d5.bin
c57899d902fce2baac3ff10584b83b400448fc41ca0cc9417d58343754d0f8dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 17560 bytes