Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d96c344d80316f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-01 16:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88005f932bdca5cd3576321b5c7923ca SHA-1: da53189c17b35a7c04864d291bfa562c9a343585 SHA-256: 23d96c344d80316fa5432d3831f9b8674f6fce374c0ef199f906c15eb656b631
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=how+much+time+is+one+million+seconds
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/affacfac716c5d355f9d5ba4975e3cec/pusopogivega.pdf
    • http://mprime.net/ckfinder/userfiles/files/sivudekejiwimotoxudodidi.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611028ef235e1---bebijisinumawadi.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8d97d31a6---42236628259.pdf
    • http://lobi.md/userfiles/file/98337618751.pdf
    • https://picinterior.com/ckfinder/userfiles/files/86150271977.pdf
    • https://cafepiolho.com/uploads/assets/69679273074.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/21444425770.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/144fa152e57659172105d9a43e7633a4/58996813967.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607196bb5f9b0---84964194576.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/sesenofunatofuti.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d13455b3---xaxopubadajeratel.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5da39aecf---48261216882.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/jibibuvojesulibipexep.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/438b9ffeb3633eee6947dc4e96a5b4d5/88175101440.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a7acdf27---xoposajaduvuwupefenipa.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a1c7102507061d7829d41f717ec2dd54/pexopikixefaxemusutifad.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/bd8f71646d341d5dab8568f0d5cac65f/68439932382.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/115fd771a44c60d24daa9e98a2cf5c80/27619953022.pdf
    • http://camionespanamericana.com/userfiles/file/51455462702.pdf
    • http://leaguengn.com/userfiles/file///69685206000.pdf
    • http://alternatifmedikal.com/img/userfiles/files/69436386298.pdf
    • https://toskov-yordanov.com/userfiles/file/fudiruzu.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/035decsad5dp6tc4gihe29ddm5/kifenelakipifud.pdf
    • http://z-sinpro.com/upload/files/pedileb.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_off0000ec04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 16792 bytes
font_01_sfnt_off00010416.bin
078e8f04dbe5955ebb073b916c0e69ed66973c008e2b1baaf2925737e76fa47d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 18760 bytes
font_02_sfnt_off0001349f.bin
c9980fff1c0767e11470c780518fc9200cf05f575ae2ce923595a14429bfecae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 10552 bytes