Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56a59f09347bdea…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 11:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16d9a2564fa39a219b3a811338a18565 SHA-1: 8e27fad129b34d5da6a793f1c29d1b924b01db28 SHA-256: b56a59f09347bdea9fd7fbb48a3fdffa8197007d60a0754928a4579fad741177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://starwindows.ie/ckfinder/userfiles/files/32268418776.pdf In PDF document text
    • https://tonerihned.cz/userfiles/file/zanabudugel.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pejisonunavita.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161409259513ef---vopanuxiduj.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/kilagaloses.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/11002400621.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/53880520052.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/31400914648.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/22862805244.pdfIn PDF document text
    • http://hbaoge.com/upload/files/60032770997.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/vusumurofifonewa.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067e04e86b---71818661558.pdfIn PDF document text
    • https://uangraja.com/contents/files/43282007917.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1632140146.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/niropoziwokoberemivami.pdfIn PDF document text
    • https://maria-galland.ru/files/file/ruwetanijupexutak.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492e439de11---zaluramonukif.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202199159184452.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac1119368---91843833613.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/33316684716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=redmi+note+9+bluetooth+problemPDF 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_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 18084 bytes
SHA-256: 72d1e4e5d71e85c914a28ace89a050dfa66e21e84af29e464a343a51cd3b7cc9
font_01_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 10780 bytes
SHA-256: 053b38da42d1afa8f39bc7c22c79be1d60676d904527ca7910d127461e951eb4