Malicious PDF — malware analysis report

Static analysis result for SHA-256 9865101b4f170fc4…

MALICIOUS

PDF

79.3 KB Created: 2021-07-03 16:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f86f9d282bf55533def1ca9ff9c30885 SHA-1: 163d29288307ea8492db86a2915f20ebc21f39c9 SHA-256: 9865101b4f170fc4f2aa2b6be81a9313e9b956530fd8ac3b55accff69fc48de0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs were extracted, some pointing to potentially compromised CMS uploads, suggesting a redirection mechanism. The PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/d7132190cb998cde4cb255f66571b79f/92290563623.pdf
    • http://odpadykj.cz/UserFiles/File/ronobimovusakuv.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/g45sqe97i051gkvpn2p4hp5c4i/malol.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a461d0d7d74---99998786754.pdf
    • http://canxetaianhduc.com/images/file/gikewigopofutukob.pdf
    • http://softwarefactory.nl/images/file/63484034033.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608efdf3499ad---dofanupisapudugivaxozina.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c1a80a0990e6a3c90bcc30e3fd10b9ca/46309544896.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608567edd198e---46558212174.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c6be73913b4d383ed09213d8099a781f/wemuxajupopukevozapina.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160714b0f6866d---domidate.pdf
    • http://flightshop.jp/images/blog//file/wapexidu.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/jli3tpg76iu2838nsg8acdn8c0/51217620961.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/nakuvotusebepuwodalose.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02e6a0ff2---74523410376.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/rveuh4hjuf2b4vn2t4jiv0c2em/36025093137.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160823b4a0b4e3---fifabafutu.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b78b200a8---wutuzolononipovofi.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da4e20c7c43---tisozedubunafavarenamapo.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/0ae3699139279aade69c3b4e98ed1344/nuxunilugisosuset.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c1351a8a0---netaj.pdf
    • http://officinedesign.it/userfiles/files/90026157978.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb94fbd8aa---xapisunokakok.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f87a6e8d7dce0fec2a8f170bdd52b90d/vefifizutuwuwisumexekaji.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607835a9a6c6b---duwefu.pdf
    • https://akvaguru.hu/user/file/botodu.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160742d2e76dde---musoleb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kushboo+sex+story+tamil
    • 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_off0000d071.bin
6e930c3ced096ac39d287657d9e85a2d5b17a80b75a054b9e9e81fc3fd001bd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 10716 bytes
font_01_sfnt_off0000e920.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 16792 bytes
font_02_sfnt_off00010132.bin
586e648446bd9545e9a17ea209d92180e34f6ab62af8ade5aa3ff7276a508511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 16752 bytes

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