Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc02409365c0a7c…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 09:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f941a88e586d8417a1857521f7b39a0f SHA-1: fc0f9593555b5ca8ec546f719953eaf431d24ea8 SHA-256: dbc02409365c0a7c009ab0b1181b2a6107ef15d3bbff4458675dd346cd659f00
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm containing numerous links to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/588ea060a6deb1f267eae8190274698c/nezivajijusurekem.pdf In PDF document text
    • http://enotecagaribaldi.it/userfiles/files/11618893197.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/v5t39b0c2aq73ok718v9pua8tv/28789656283.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/57137275716.pdfIn PDF document text
    • http://primaneighbors.com/userimages/rofufutanigepezo.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/81606435073.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/34639462131.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c034b9c6d7b---sibipukitomadobosabeziti.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/koxokatefiwonesilefiwej.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/53797139104.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f1cf21605---77793834914.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b76360656e6e36491d7c3eb81b59c537/fetijopogidu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/df058796e9ed78370f421854600fa851/85796300485.pdfIn PDF document text
    • http://ipceurope.com/assets/file/59609139106.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/texilibutegewam.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c71a0a8b---tegejumapugatoratukegiv.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161256fa7e2570---repirevofejeginupi.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/nozeximibelilipoxu.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/bemiwumaburazop.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a9b9b45c152ea8ee6bbac55bd1e81dbc/54600922890.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4mujkfdgehlht512u8p2geskgn/bupafefitise.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/nagidetutifor.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/49664987170.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/lutagisanaxubisef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=9th+book+of+the+new+testamentPDF 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_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 18572 bytes
SHA-256: 721245415c2741552a3a317875d1287e645987bacd660b1606ab6a54267b67a3
font_01_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 10628 bytes
SHA-256: 7e28c53a25fbd33dedc24a7f016b96b40f6075d060d23c25e8dd8dd3eb5afb92
font_02_sfnt_off00013a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1