Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdda60fc747df67…

MALICIOUS

PDF

85.7 KB Created: 2021-08-09 17:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21eda0855c35427595abc69fb7789ce8 SHA-1: 5352a8b8744385a7f5a899fc200ff7d37ed37553 SHA-256: bcdda60fc747df6774d310a0887d8390de6348176567aa9cb480008ffb391897
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, 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 malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://tennis94.fr/img/pics/files/pujarig.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/1daa52b7e734597ffb53826a513a7a6a/bidomabikaraje.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/safoxa.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16260987374392.pdf
    • http://dblbtech.com/userfiles/file/87562854983.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/52b9356e2a7ee337d730cb1c3cf8ab42/pipokunorewibe.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/694tnnqj0pi78hvjmb0b1ug7u4/76856586690.pdf
    • http://smartvoicecom.com/userfiles/tojumonojif.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c129a5cf5---favelexifurexijemofiw.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc64ab094---7152460337.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d24dca1c65---44765152177.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8mlvv6u4uf1hrgjs9funj5lao3/tasejoxivafaluxiresobu.pdf
    • https://bostoncake888.com/UserFiles/files/25378403307.pdf
    • http://www.dean-cpa.com/files/adminpic/file/5000821357.pdf
    • http://engroupe.ca/aym_image/files/fumidetonejabanulij.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/suzenopov.pdf
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/fapuvasodazibijakog.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/58239297203.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=non+dot+chain+of+custody+form+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_off0000ecda.bin
05fd03856e2ab58c9cc5fe4311c445f7d44b0586cecb9410b19737c49968ac43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16520 bytes
font_01_sfnt_off0001179a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 16792 bytes
font_02_sfnt_off00012fb1.bin
0ff7f6d0e8b9fc68210d79e389028adb56d2956a3b710ce0781a0d2ada67948b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 10900 bytes

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