Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec25057631fc148…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 04:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3a8c98cf9da283eb1637d3363638e34 SHA-1: 4d151db49cf265d169c7370dc19e4290d2655b20 SHA-256: 3ec25057631fc148632e020aac16bb49d5b9bd2fff2d36748c6fdcc32ba3f51a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, with several hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristic firings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cosplay-expo.it/ckfinder/userfiles/files/96796824704.pdf
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/8702077830.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118bae7771ec---64010346707.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910ede3c627---1191996305.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/719288f457cb446b446f1d381ad59574/xonibodawuzujekebareto.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5480861f2d8200eeb27ece247a2390f2/noxazarukazatuwus.pdf
    • http://sghr.ca/upload/ckfinder/files/11245122307.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210719144647.pdf
    • http://grgct.com/ckfinder/userfiles/files/52678973344.pdf
    • http://merlegdoktor.hu/tmp/68820746695.pdf
    • http://surtek.biz/image/files/20150131_210529.pdf
    • http://tnslib.su/userfiles/files/simasarazavudojebawux.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27901eceb---30773412170.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161110801f14cb---73772300953.pdf
    • http://fratellilongoni.com/userfiles/files/nokaxozixawidatefomapaji.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607d09077e6e6---70030014719.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaae19e986---84891884327.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077432985530---mulezezokazizabulekujibo.pdf
    • https://subarini.ro/mm/file/29744086658.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/jabeziwisol.pdf
    • http://hzjksj.com/images/upload/File/tawalenud.pdf
    • http://santamariamikado.com/uploads/files/70905991760.pdf
    • http://kameleonhastanc.hu/files/file/56004372165.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/508e3333f4a135cbde6897a0402a0d0f/terewelewolamewogove.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=amphibolic+pathway+definition+in+microbiology
    • 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_off0000ba36.bin
4924b0d8a7186ddefe0593936ffb980a50430282865c433b7518ebfc1dd59e70
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA36 11220 bytes
font_01_sfnt_off0000d3ed.bin
783223192a65ad79e93f2b7c60698d752b7618fe503dcc7ab4917e85a9cc0be5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 15452 bytes
font_02_sfnt_off0000fa94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 16792 bytes