Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb30ccd32cf9501…

MALICIOUS

PDF

95.9 KB Created: 2021-06-26 05:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 330f1342bae72873d6b6d0ab8f6d1ef9 SHA-1: 3622be83e585d8430e27384b68cb413bd06dcec7 SHA-256: 4cb30ccd32cf95010dbc340ed10ff8c9724422f1a12fe88e9e7f2d9cd26bedfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085946f3f3d4---penuz.pdf
    • http://gyobel.itpublic/file/17740186880.pdf
    • http://brandnewgoods.net/userfiles/file/98943749321.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/5cf034893e310817320bafe998db912e/moweginupedivude.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0179d3ff1---kinimekok.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/46acmi543o6ev01k0qfak22sip/28992436008.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/mskp26up0pje2jokv1pablk000/58502460736.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/20864098268.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609258a0c7b3e---pupuwosotixu.pdf
    • http://nextgenship.net/upload/file/20210523162176333681.pdf
    • http://ilcaminodaugo.it/file/98325875387.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/95vql2qq479ob4bb2ihpqhjb60/14915222189.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc8fd4d45fad8c9dbf6ef34f2aa365ad/badeguluro.pdf
    • https://gruppopolidori.com/upload/image/file/vijadojoforora.pdf
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/13480156899.pdf
    • https://bmat.mn/uploads/ckfinder/files/bafej.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/cef6d61ea515da8a2ed911341b73ee8e/37853208012.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/nivofudatojexef.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609910e8f0cfb---wobexitati.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2f28b22c---46621039745.pdf
    • https://ludifrance.fr/userfiles/file/55559032457.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080b95901be9---vivesukupawojalewexik.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/13741367797.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed913507d0---21705478827.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=transparent+materials+meaning
    • 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_off000115b2.bin
690dfe66d801aef2ebd80bcb0916554aa15bdd08b45f1b3161c4bc9030030e8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 10440 bytes
font_01_sfnt_off00012d53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 16792 bytes
font_02_sfnt_off00014565.bin
3d28deafadcb5c136f83529828ffcb69805f2111ec0424c7bfd92a9b90505dcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x14565 17100 bytes