Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b1fcc5d983e62d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 07:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8160e8ac40d1e4761bf403282d264114 SHA-1: 3501e9d9f2e8d1fac6d9680595090ac42721dcbb SHA-256: b3b1fcc5d983e62dc2c1191122119859947aeca1f97a97fe488af503309cd911
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613579a72ce1a---92515533229.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0d14a178666c940031625c5c90e88c58/53393810564.pdfIn PDF document text
    • http://japhina.com/upload/file/lejokuwo.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/vonimeb.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b86eca23b6---fasebokotuxezupuvuxumake.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/fenomudigujulivo.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/worifogixe.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/dosovop.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/jozogojedito.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/8750827698.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49850155441.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/fafageraruxabapivudijagi.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/xalawetikinilipuwe.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/31346574041.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/xewimiguramesolagije.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/69315410448.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/famaxizizox.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fe53736b---42022994822.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/9375487970.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7pvoc0vun0m3mh1kkrsv27sird/nunugu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/98f95517ece1dea7bfe5d012940c2fd1/roxez.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/wisuwonodugorekok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+move+photos+from+internal+memory+to+sd+cardPDF 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_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 17520 bytes
SHA-256: b87c2445bed4cce5206b93ee2bb003007374f686c0922b9b83d4548cba9e6c4c
font_01_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 11140 bytes
SHA-256: 9b2982161faee6226945e206f81c8ac329b1d68e4fd89377a7d1c0fe8c407cec
font_02_sfnt_off000126ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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