Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5cc8f3ec1a11e3…

MALICIOUS

PDF

89.6 KB Created: 2021-06-29 00:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f88270fba5f593acce79b9d2c44b4795 SHA-1: e40a4392fcc831408a9e69dbd760323b803b370c SHA-256: 5c5cc8f3ec1a11e3b05fbb12ee218935003c2eab2cd5eb31799004c55a3ca2b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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 http://notarbrazda.cz/userfiles/file/53615816589.pdf
    • http://al-bandak.com/userfiles/file/gabatojanovilatar.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/70de9396a151f2af97b00e7d35cd8924/63039867916.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce63525758---44295549183.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a97986d85---40540445330.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeb43c63a9---1991986496.pdf
    • https://artbynela.com/uploads/file/lixivikifulimusuwapud.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d66168794---87172893986.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7b9dfe7a703f14e05c2384a7aef9c36f/31469833835.pdf
    • http://files.ibiza-ferien.de/file/zazikojatipojubixixu.pdf
    • http://otvorene-srdce.sk/userfiles/file/begijufijoroxaxudosirup.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/81844350495.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/474ef6ecd1cdb7662db9203d2bc20a58/65658908691.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbeb016d8---midegotewa.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nj3nth9djsl51bkuslsb3qjee4/79090949999.pdf
    • http://southport1969.com/clients/861680/File/49456016415.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de139df92---47054478186.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4d7e7bff4---favugopirafutogazus.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608badbe21f67---mixenimurawopawu.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/b100qklt8hpsr6h7iiqaagj2hd/94681463716.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segokazejawotobuv.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3f09aed7---nitabitajasetuge.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094653a03812---6487779393.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=syntactic+rules+of+grammar
    • 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_off0000f97f.bin
d0249677e6865dae0355be45bfca711336930a1dc4c3a4a6f261025851a64b43
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 17804 bytes
font_01_sfnt_off000127a7.bin
9362ccbcb3d30b07bb63d255d88a336eb1bad769506f2674de05540214e7fa1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A7 10968 bytes
font_02_sfnt_off00014127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14127 16792 bytes