Malicious PDF — malware analysis report

Static analysis result for SHA-256 54af6707ed2ee546…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 23:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5b8f352cf21c6612812fc6255121e113 SHA-1: 0cb9f960e67931bbe461cadc6c808b725fcb77a3 SHA-256: 54af6707ed2ee5469ceac2bc9e5023014bbedf5a9c754c4c53937d2100c51794
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code or phishing content. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 http://adria-ex.com/images/blog//file/72149486647.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/83780734667.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c7af0fb94455b2196b624041f22a4f44/lowujav.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/divurawosujubipadak.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/j28n321gf1eoonh5qvsnglab2d/vobuba.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609be0fcd8d09---ladomuxesemaxepav.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074482b90f28---58500678042.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916d4802136---5958592506.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160789da7d175c---fojovib.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2468ffa6d488877b50d729ce98865f2c/benikobivajuranopufi.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/29771377693.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094936337585---bedibodarepa.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/pawufe.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t308j8jcq47kba4ckjp0g86rjq/21236594337.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/vadud.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/gegufawalefovazapib.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf72d63d8---82747905350.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/70112836948.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/kinilegoj.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/64780306866.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/56377849109.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/24281748777.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32597758a---28064012866.pdfIn PDF document text
    • http://funperm.ru/content/file/32314782139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=apomorphine+aversion+therapyPDF link annotation
    • 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_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 17396 bytes
SHA-256: 44c99b7523af800893e686482a3edfc6b12028ee54290e134e261db0e992e8c7
font_01_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 10632 bytes
SHA-256: 4f7952e249418fbd8c5180886995ccb998cfdbbc9cc1dfb11255848c2ba96941
font_02_sfnt_off000133d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1