Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e77203c6c9c36db…

MALICIOUS

PDF

79.3 KB Created: 2021-08-27 03:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 723362f91c22cb2b8a4ef2dd59bf8597 SHA-1: 47bd04e4ea84224a13e18b01ebdae5ff3e4c6776 SHA-256: 3e77203c6c9c36db5c51ddad334d5850909dcc4a51115b6e7cc290b1fbc15ded
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and extensive URL list point to a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=moab+rim+campground
    • https://onelineservice.it/file/28773089974.pdf
    • http://theheavent.com/userfiles/files/sewutixeto.pdf
    • http://dsacare.com/admin/uploads/file/3151559064.pdf
    • https://gomaihoa.net/upload/files/58932469411.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c739ce99829---gidipanikirur.pdf
    • http://goodwill.pl/userfiles/file/44475105835.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tra0p3bh9aghqgfrsvgp21m59a/40361722253.pdf
    • http://jirehenl.com/userfiles/file/290145258726.pdf
    • http://iiiemjobs.com/FCK_Editor_Images/files/xibevozininiw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f962fce3a2---2190847689.pdf
    • http://xenangheli.vn/public/files/40080608613.pdf
    • http://www.logomarcanet.com/userfiles/file/mirujevegoziru.pdf
    • https://makenie.com/upload/files/pojer.pdf
    • http://www.abcklima.hu//data/editorfile/kisusorotivebote.pdf
    • http://zaun-produzent.de/userfiles/file/fabamerulifuvudemu.pdf
    • https://communeouchamps.fr/userfiles/file/50873678851.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607275500d604---77007841270.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a66cc3a4e8206f4da5aca113c665c298/63501336961.pdf
    • https://laughteronlineuniversity.com/images/upload/files/lenalomobil.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e55e52a433d---25905909794.pdf
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/52919708954.pdf
    • http://nhatngungoisaoxanh.com/upload/files/wekevesutusuja.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da33c9e612---16215372677.pdf
    • http://donghocasiochinhhang.net/uploads/userfiles/file/31492855167.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0721bde00b---48233237265.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cd864313d---nabuwabov.pdf
    • 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_off0000d3be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BE 16792 bytes
font_01_sfnt_off0000ebd0.bin
16d1cfec21aaa18c40f4417454803df72096e440c53115adf556599ea3829496
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 16892 bytes
font_02_sfnt_off0001176c.bin
42e95f96b168d7dc5ec89a3b1ebe893c82bf1bb83742a990a19b841be2b07cf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 10644 bytes