Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d90079d8c2ee09c…

MALICIOUS

PDF

89.2 KB Created: 2021-06-30 03:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 092bb1d4f5720166802b9b4f27e011a2 SHA-1: c739d964bed7c220d7aebd22dc3ed834d379602d SHA-256: 8d90079d8c2ee09c70e46bf33f930ec75d01a16128841845a3f1a52ebe3b49db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm or SEO poisoning attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is unreadable, but the heuristics and URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/psath8geo8cfh4tncoadgcjp0u/54199927693.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891ba332d3a---40382459309.pdf
    • https://liniagdanskzydowo.pl/files/garelokixasudeseber.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47bf14a86---ralofunezepa.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ac7ne6b8hf7m26vf29lmpc5pkk/38260872787.pdf
    • http://venusland.vn/app/webroot/img/files/supovigurevuw.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/de44bef6416e2402e67fc5c5b399e583/defilari.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076834d6f413---92865708573.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/08pof7kmrsma778k99pscqpvb4/kekaparatisigibisejag.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0a420545---93680429735.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a155487c204---karekomovar.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6d882bbbd125e8d7188b1999584cfa1f/tetel.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/adf9bded49831edb73a810be32231513/41763426031.pdf
    • http://www.aadhar-interior.com/userfiles/file/90444409443.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a3e1ecc4---xaxokokajuxu.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5c8bbe2bef68b167cdbcff38382785a1/56911749360.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b781f64eeae---50363635778.pdf
    • http://homenet-spb.ru/userfiles/file/duzaletaluti.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c885747a2be---44086736309.pdf
    • http://becucci.it/userfiles/files/vivujosepimowenufufif.pdf
    • http://sooclose.eu/upload/File/8832189103.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/4kcr2ob3gvs3bmvlic0ij87vt9/vekizanonipuxejoluxol.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/191gmabgr7k81ihsskd5uen8p9/repikelepa.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/19df3bf737513020948a926d731114f4/suvenule.pdf
    • https://mmszke.hu/files/file/tolerukimolexoxagesifaze.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=song+of+the+year+2021+grammy
    • 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_off0000f795.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 16792 bytes
font_01_sfnt_off00010fac.bin
724b954a0a3a51e346182a58b71b5f285cfc9713925d09caf76f9265af6c979e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 10836 bytes
font_02_sfnt_off000128ad.bin
d2ee4aa4e05ca28fad7cdb8e59f085f32afd6e03e300a2efdbfafb273fd4e91c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128AD 17860 bytes

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