Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b9e7be795c8add…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 07:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44c8875a7b1ad434b21e25b9be584384 SHA-1: b7ab198152f54edd854ef50109a5200bdd6e828c SHA-256: 84b9e7be795c8addad6caed8998bb5c23df61cd7cd846f56c458135960c2e7b7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised CMS uploads and potentially disposable hosting. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://tubietelbar.hu/uploadfile/44524320335.pdf
    • http://harmonie-avion.fr/actualite/files/nexobod.pdf
    • https://vespaclubcagliari.com/userfiles/file/fujosunodofexaduvorape.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/lilokarebejufixuvusi.pdf
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/42191306686.pdf
    • http://twothirdsmajority.us/clients/38522/File/13639436046.pdf
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/8621035368.pdf
    • http://gfb.it/upload/fck/file/radugarupezusikabadebe.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd08523634---24187024603.pdf
    • http://sualpturizm.com/userfiles/file/labimutivosomosoba.pdf
    • http://gtshotel.it/images/file/vepojudebas.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/mapatikofubonozop.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/17d8f5dd39a4d8d16c2eb0c724bb1482/zifilorofili.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/55191341beb8245acc64d986c654457b/93054206156.pdf
    • https://vibangnhadat.com/uploads/files/51057572505.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b27a9f1fc76---3656067865.pdf
    • https://xuantruongtech.com/images/ckeditor/files/furazorutidukurodapexoko.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f40a5e4852a---18464250014.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160905dd3e172b---xokafupapoxofon.pdf
    • http://crosswaysrecruitment.com/userfiles/file/28168472055.pdf
    • http://vector-mebel.ru/uploads/files/37361648677.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/phb7lhp04tijr7rp1ventuch7h/lowekivarumetenofexatik.pdf
    • http://easternsheep.by/app/upload/file/fufunitepuwagoxarok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=matrices+java+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_off0000b560.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB560 16792 bytes
font_01_sfnt_off0000cd72.bin
5ddbd69365c2061f6c83b07ff262dd8cbf3db170aa8146d7b8b539e2371d921b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 15120 bytes
font_02_sfnt_off0000f3e3.bin
743b6841fc2b74a2f51eae261023239f3e27b1b8903e8f9cd349496545b3942d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 10532 bytes