Malicious PDF — malware analysis report

Static analysis result for SHA-256 942939548254dc36…

MALICIOUS

PDF

94.2 KB Created: 2021-06-30 03:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eecfc1891bda3a19661468380b37e600 SHA-1: 61a69de7a17aaa5e1f00db15a837e368302c0d44 SHA-256: 942939548254dc366768c3daa10e69a1cd461fd09590b7854e7f56867f681dce
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple compromised CMS upload links suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3149a8188---lidivipu.pdf
    • http://escuelasfutbol8.com/docs/files/povugolimoximikatitufo.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qaem543e51vfe9oekols65effo/13952811319.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd709daa66---sevalesazededegiwowo.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b78522d6ac5---dinewuluzezajim.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e1de35f22e02c99a1abac0a58968232a/79882306914.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f18dd32040edc37e19fa055a2b2c06ef/78110791539.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/12abffdd840ab1e5792818fcde1e1185/50179608240.pdf
    • http://traiteur-ribot.fr/userfiles/file/lanivetewejopef.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41b8a68b20---nisozekenumotisixapatotu.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57d67873b---16404428889.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1e69b171---tawujexasotaranonetinexal.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ca73ca12---sowetesebabadexutetadu.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073db27b363b---vetuziwojosutasijen.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/10b9f38b943d36154140c145e58e1d2b/fufatu.pdf
    • https://ilcaminodaugo.it/file/lilomupes.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/98470548036.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707690f1d3d---dagixutozozove.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9914a7b1311e4edf7ada8ab99db8273b/92980239416.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/8sqdaattaaikeh5h5ufo76ot35/mawonopu.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/22a7b9cfebce65682e94957edd64f21d/78951080241.pdf
    • http://kidneytexas.org/clients/861060/File/sutipewaxumeku.pdf
    • http://leakefamilyreunion.com/clients/63964/File/77531169697.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=say+what+you+see+quiz+and+answers
    • 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_off00010ccf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 16792 bytes
font_01_sfnt_off000124e6.bin
483b8f1856b58972560678ebdc0cec5faf5aa0a4353c951fd7859a06237f02a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 10880 bytes
font_02_sfnt_off00013dec.bin
33a1defe90e7f08b33ec7c2fca055a759f6ca61f1821476f73b8123ffbeb22e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEC 17488 bytes

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