Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ded25448902052…

MALICIOUS

PDF

95.5 KB Created: 2021-06-25 23:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b2298866a1eb8e58a63a1ff048699d0 SHA-1: 4859e5360089fa9d9ea533b10c24257a558cf70e SHA-256: 51ded25448902052b5683e79419a30c07d6056a95a19aa372280babf332a0480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://garglob.ru/uplcv?utm_term=jayco+tent+trailer+manual
    • https://codecs.ro/images/file/59033888462.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744d1049080---guwaxazolexopovobi.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162208372183.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e29a1294---33606754286.pdf
    • http://gildiamasterov.ru/userfiles/file/bitudivebederisujemu.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607570d7cbfd1---lagimo.pdf
    • http://kojeneckezbozi.eu/userfiles/file/xaxed.pdf
    • https://alamansyria.com/userfiles/file/16472501087.pdf
    • http://newgrids.com/userfiles/file/nadejesiwekimapaju.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2hbg03h3l3etifuq5jmuu21mop/40457161252.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080200bd71e1---jatedopalaranoviwu.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608286398663f---25409773299.pdf
    • http://resheto.ru/users_images//fck/file/risisuxobegere.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acb508a3cd3---wisubizoxununebofinos.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bvm57jlpn023o58hfj9p51iot2/62033945581.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/96f3bf10a60215db3d8049a43d82a6e0/bevudebexeze.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a87384bb9---80724037698.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081a25565fdf---penixomeduxurexoson.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/qg9l7ahodisp0fs7leg2b8lhd1/38313025813.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eggp3kg7gch6a13mdeg6nn2sa5/jenovi.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da0ac8a653---pubogovunojewawuvigakane.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_off00011561.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 16792 bytes
font_01_sfnt_off00012d78.bin
9ecedf9b549ff275172e56170d4e860f9250f2ed753147176468e7c021dd5b09
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D78 10428 bytes
font_02_sfnt_off00014521.bin
22b9fa1b5bd8f55e3d38af6ab06c11c1c2403e45d2521aaa923b0eb67b18c428
pdf-font-stream PDF embedded font (sfnt) at offset 0x14521 16996 bytes