Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb3afa0c3df13a7…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 07:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d20afb4d3eb283865bae92220fd8df6 SHA-1: ab5b1feb862055d6b3f5f970546bdafe1078b654 SHA-256: fcb3afa0c3df13a7d0bca2e4f7d132965e622997f67a5168446f595567bd785d
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 and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cructi.ru/uplcv?utm_term=the+gifted+school+book+review
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ef0d36c97---lunemaniwegisenaviwotafem.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/39923419999.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1bo0v3kubh7lb73r2ddgpcemkr/sononofiroduwos.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b7f379af0c7089b82d023b260af9cc8c/padejedaviresisofimosok.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/5f775151c397db6fea2685ecdc5eee52/9200322629.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c93165c65e---nomilekibiful.pdf
    • http://netpost.vn/upload/userfiles/files/lolotirufivatemoxoma.pdf
    • https://zemiigori.com/uploads/file/gixufori.pdf
    • http://alexhofford.com/temp/files/file/40987929490.pdf
    • http://progfin.pl/userfiles/file/lowibobuzitatozejutodejob.pdf
    • https://creteservices.com/FCKeditor/userimages/file/98525686011.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/cce07c5cafd218dbc5138b00d4c74741/sebokidovolidupalemisusem.pdf
    • https://3drm.bg/uploads/pictures/files/wozasigugafuzuli.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e380e5b06---lezevozudabuli.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/12d251b2537a91a79c948679e8b79ae3/javaguduvajikiraferatimo.pdf
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/pifanepima.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07d8f6a16d---37331983639.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b185a901---fawuzurev.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/majd7831tlsmnt9ctnpnjkm9k7/zusilerafebisidizewiparib.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/57690558d8f9fc24dab5c6e74b7e9408/rasoxer.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080562d86b5f---timukozobizex.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d1d0ab66211da46733198c33beb8b152/48649274686.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_off0000ebb1.bin
b6e62d446824122b1f5b4f109e8094d21b6ebb8c7c433e3a18e81941a6955dde
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 17172 bytes
font_01_sfnt_off000117a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 16792 bytes
font_02_sfnt_off00012fbb.bin
fd04f6bcfa1e0ba35de127e7867f13a82028e9f4effacb5784ea263ac797a7f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 10836 bytes