Malicious PDF — malware analysis report

Static analysis result for SHA-256 199d1b38dc0c4d98…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 04:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a65fc86e52b859d94be234e41e7e8d40 SHA-1: 5169b59be314228936eaf0e40b8ae7765193a8af SHA-256: 199d1b38dc0c4d98d73fbe4aac2aa42b430c8deadb3388db1ffbf6360791c55b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown-reputation URLs strongly indicate a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=john+deere+d130+owners+manual+pdf PDF link annotation
    • http://travelshops.pl/userfiles/file/69307244981.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/33476570440.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vdod1srk2ffamevrukfr976207/15437897451.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c46c4f993b84d2c80aaf3ee5823c4e68/64834844709.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e37d43c58856bb6fa905034365829f44/20914056656.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/99007918908.pdfIn PDF document text
    • https://ntc-container.com/upload/files/wojofibopob.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720e5e9ed31---32540786516.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/52599996219.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/g0lj1kdnq8vn8kijt7o6h1atif/nibilevapixelijekituviz.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/xizafisozoveduduf.pdfIn PDF document text
    • https://limsurdua.com/contents//files/netew.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/21f72c2f1032b3c34b1baf70e31aa06e/98389640086.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/91657769588.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/72379868835.pdfIn PDF document text
    • http://labonscafe.com/userfiles/55482544334.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3ffddadab907251d10933180b4af52da/kudipapumaxizuve.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7abc96a80f832bf45ebe7e4ceb78b888/96276169548.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/65396396447.pdfIn PDF document text
    • http://telecycling.info/files/file/61321485911.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/44782792323.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d415bf9c4---33696774875.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/567a9610255befbaae48ce8bbfa92622/77311257252.pdfIn PDF document text
    • https://latework.cz/soubory/sisezatulumosusesibini.pdfIn PDF document text
    • https://ms01bet.com/contents//files/67828808578.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_off0000df93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 11096 bytes
SHA-256: 95f449ef9f70c19f3ab9eb1331d509836c8bcbbf9e4b926ff2c9832b53a4872c
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 18148 bytes
SHA-256: 17f2eb87d4feec9c43d13a194c94845e897e9503ec4cf778457bde84c315c011
font_02_sfnt_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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