Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d2b3adbe42971f…

MALICIOUS

PDF

100.8 KB Created: 2021-08-01 01:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45dd10ffd68679caeec4aa4995a6e752 SHA-1: b787cf2df9a2e65e32eed91af438cbbcb3c86d4f SHA-256: 37d2b3adbe42971ff68794a5966da89dcf63a4f9e86e40ff6bbec0e3a7a5a4d2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, likely intended to trick the user into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to facilitate the delivery of a malicious payload disguised as a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=ppsspp+games+download+android+assassins+creed PDF link annotation
    • http://esoftland.com/userfiles/file/96347385283.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608228baba05c---17903077467.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/fezusilufidurexurajafi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7565d2e12d---leropisogagabaduwuv.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/93883985989.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d2dcd1d47---wefewepewuze.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/75707469814.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l9ioq0rufonbhb57bjv4k24hrd/71901330442.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/1546618147.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b8651b370fee78829a7186a910b5bdaf/toligilagobulokaripid.pdfIn PDF document text
    • https://ksboutlet.com/file/files/94777993771.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ad2eb259e0ab445a3e11e2d1335323a3/48473704359.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b4779631c18---60326277490.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/22534324483.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a444ef76a66---75876764604.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9747d9785e---selijokavikiza.pdfIn PDF document text
    • https://samowar.ch/upload/file/rofugexiraxowulezuzor.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/4cee78bf75f7735184d664d864df2a42/ligodukemofukonozawusaxo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/pilodigorumoxogezamig.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05d70d0ec---giweb.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/49517267490.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/suwivavewedobuwigojuruvux.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3666d90f21c7718a0f4dd51044d7a8b5/wigadurexugizigibewox.pdfIn PDF document text
    • http://planetamama.ru/files/file/82545586718.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160859440343a0---jotaxirukesu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a7ee2c231---8210355684.pdfIn PDF document text
    • 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_off00011f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 10844 bytes
SHA-256: 978b38a93e4623c94848076007dcc03898346f5d2de12d38329d6d079b6710d6
font_01_sfnt_off0001382f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382F 20532 bytes
SHA-256: c97739addfb3d33af3dd9fe6c8319726a36b669fdb1d2315f55105846f7890be
font_02_sfnt_off00016c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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