Malicious PDF — malware analysis report

Static analysis result for SHA-256 1607745cbddaa08b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 18:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8470c96a96359e7743a4ac85629177bd SHA-1: 9464bf194a1c17c754be5ced4e9ac90463a32692 SHA-256: 1607745cbddaa08b2720a3ffaf8805bbaa2a6594b237358aff6b896eb71990e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ade6264eed66d6b3b62464233921bb16/36165592942.pdf In PDF document text
    • https://chasehr.in/userfiles/file/mujuti.pdfIn PDF document text
    • https://foulardfotografando.it/file/11493980948.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mip37j3cj1ldarpfklrae2t443/36763499598.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/pegamukotogoromi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d23633b9---kedup.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/nonebojudebun.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8fc17a85d40e1be12e5d2f5f21f2ecb8/41549619804.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/tejenavonaju.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777e90c848a---bawotipeluminonugibokafof.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/vosoruxebaxositarokorawu.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/14655559796.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/78468016839.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/58086320630.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ade503a5d---zudagejesak.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/21876390097.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e9b5e1838acffa2229b32228ed1b5ed5/nobukiw.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cb41d5e1c0915f6fc2eda82a1d19f0c5/98183246768.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b91b9f3ee21fb653fe645b8277bb9b89/50471246437.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/6660029418.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5r36k1kn0t4o7g6267jkg3i242/58296317322.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4jk0lv44htl6ei887s2ui1bif2/viwil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+student+budget+answer+key+personal+financePDF 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_off0000ba4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4A 11392 bytes
SHA-256: 204b1677b5524973609c4abb471a43da0bd4bdad0fba38be4bab9ad3d5254d76
font_01_sfnt_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 14996 bytes
SHA-256: b097d86732ae9ea1e78c933ec863abf115a6ba16e60583b57241f7834eb8270b

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