Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47c213a286d98dd…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 19:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b540c51afaa94cd8b5484fffce6335a1 SHA-1: f4856ee306ca7436ce2a44287bcadcf282df31f9 SHA-256: c47c213a286d98dd07eb47f984b7787262cfb488384e7ccfc128e9b1dc9d5a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The heuristic firings indicate a phishing attempt, likely to trick users into downloading a payload disguised as a license key for Grand Theft Auto IV. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://vita24h.com/uploads/userfiles/file/kegugesefuja.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ae6f011d---bisezonefapixitof.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/eed488062da0c5eddbe089a1a7333b56/madafadexenubu.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/97635477708.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/losezosalozop.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2209ece194cb37eaf1b808f7f2a4afd7/42013215872.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/sugijofu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d567bba3dc2---wuwuxaxagakoj.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1c6c5e7012d0c380fdee27f1a94fc4f7/24410605652.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/vogibirexafoji.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/62815070864.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210901212452.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/sajuxa.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c556fde57d7---kerumudiku.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/12675cb0adfe2ebb971d8aecfbd4ce0e/zaruzibufelafewedu.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/telowuxujarejurojiwido.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609754afadbb3---worogokorijodubilapa.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6790634c7cc41fea42a3d5b4b92b35bc/171020105.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfcef57c44---24578763333.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/sudejuvuka.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/49268401608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+license+key+for+grand+theft+auto+ivPDF 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_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 11216 bytes
SHA-256: b44fac2ef6d7e831946ff42cce960cf2deb037ece62b6ae4882ea86d4733c1fb
font_02_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 18216 bytes
SHA-256: 3b16bb39c37148941266142380b2303b32224f46fa61b88d07ecd58e0a4d9939

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