Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c73fe3ca1397a96…

MALICIOUS

PDF

89.3 KB Created: 2021-07-15 22:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bd032d0ae8e9b5d742a1162608ae302c SHA-1: 9bdaeaa3f76159dc8142210e395a05b3b868b86d SHA-256: 6c73fe3ca1397a969602582de2138e9bbdfe859b83e251221f17f1e1bd07e3b7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely intended to lure users to malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://designclarf.it/file/439529727.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/cgl3biqoa6qbr7bi55cj43rtit/72438668478.pdfIn PDF document text
    • http://adice-area.com/pictures/files/juvikozifomunazerofedetep.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16070a44a0363e---1001328002.pdfIn PDF document text
    • http://beiks.info/public/file/29674224690.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/jibudowoxujuzovonuf.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8d3012a1a---3644191288.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85bae25b50---xisusobexezasixoxore.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1oko5h0m70fak16ivekro5i9j2/78545607587.pdfIn PDF document text
    • https://2acontractor.it/images/file/bazumapu.pdfIn PDF document text
    • https://btegypt.com/file/66989583624.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/f988b026b8be26de5eb3f621be0668d2/wopur.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2aa8f5a6---foruluwamux.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062622185468.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f802c7c56b682d71e08bc7e8656f1672/52252552608.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/688ab5ecf7016c0f9b5e4f419e6530cc/33408746912.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jo7a749qhaon69gfplbnb6vpa3/52753179360.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/1ptbfh2qod76u7n9vfo0d22uq0/83631315589.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f6b0c4a94105fa1a1f3ec26957c6bffa/pixej.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/jujofi.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5vtk19e6llic9cjccv18gcp6g4/gupigupesitasutejiro.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6177caf8---juduxovesuxozagov.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b264186a767---79268800502.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/dejavokariwiketisoguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lovely+quote+for+myselfPDF 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_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 16800 bytes
SHA-256: 806b04e26cb20085337921547c6f7141d575e551b1abe04b2f7387ad3a08bd37
font_01_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14088 10400 bytes
SHA-256: 2310a7a2619f7c666cccc0594ce94834521b6cffb7b0065c206b50c76e1f25e4