Malicious PDF — malware analysis report

Static analysis result for SHA-256 44540f6c52fc35e1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 17:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 387d4e605199ae8cf7c683aad96be69b SHA-1: 2d27cac1e107d9ed9630e57fb33ec514bf9ed5f0 SHA-256: 44540f6c52fc35e1c630896d95c46b2855fdf80d2d276ab631def77b8c15adf8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=representative+sampling+pdf PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161206ce295c3f---biwaruzazopazedufolenise.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/82281824650.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/ec6555d2bd0919b76bc5ae0b581d8a66/gedobariliv.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa30b519062---82936494651.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/pubaxug.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210816_938F015EFE610424.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/tanofokurezijovumupufif.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/97128039479.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/5886605749.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607125eba173c---107892541.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l3d232r44vt4gjavmvgip7nfgs/notalizavubaro.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc126889d38---98437210503.pdfIn PDF document text
    • http://dr-temt.ru/images/file/fonexugifaferunawozewi.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/35717985398.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160736bf8a9932---repojowiladidifidosazir.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/58053940880.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608388623cb28---rumawazexosutomig.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/xujadaxukejusetatovodaj.pdfIn PDF document text
    • http://gnox.vn/upload/files/zolutevawado.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/7542920105.pdfIn PDF document text
    • https://lorus.rs/files/vamajubidup.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b878f10b92a---gobado.pdfIn PDF document text
    • 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_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 10832 bytes
SHA-256: 814b4dc63c661f639f548012be7c5449b8e9dbebbf9b44692cbdaf5a9f35c997
font_01_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 17412 bytes
SHA-256: ad4d98b52b0ec5641da4e56f5acf9d59388cbfa05745f37a6b6560b4d7f8dc28
font_02_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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