Malicious PDF — malware analysis report

Static analysis result for SHA-256 014763c9df0c96b8…

MALICIOUS

PDF

80.5 KB Created: 2021-07-04 07:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f585ed3ebd77bccedb3bd2799d8fe1ff SHA-1: 6b431562dd43aad08b4015a643645649bc9061d2 SHA-256: 014763c9df0c96b8c24c085bbd5a778dff1bf742c7a4d04df685111dc67137cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics point towards an attempt to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=a+natural+magnet
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f784b4d7d2911926e6623a7d2ecc4f18/loremonubixobutexab.pdf
    • http://www.firengo.com/userfiles/files/22881071629.pdf
    • https://ludifrance.fr/userfiles/file/jiduwuk.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f1e6a11b---6793209723.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7obgi7ldpe3r63b6vrdbonhc55/venugirusurekixisakaxuna.pdf
    • http://stinpo.com/ckfinder/userfiles/files/jitageditu.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/gerexutobolegawejat.pdf
    • https://etonbio.com/newsLetters/images/file/61317193058.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/60071144166.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d892206bb6953dd2eae296c8f6c81c3c/50981977749.pdf
    • https://actor-conseil.com/files/file/65494813974.pdf
    • https://burgaseguros.com/userfiles/file/xesizuniluzon.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077061f8c9f2---tipis.pdf
    • https://k-newsletter.com/ckupload/files/1498042754.pdf
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/puvedufibodinef.pdf
    • http://kinel-hunter.ru/upfiles/file/xagujan.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/76b4d991040befe335174bb120474ac4/61079734694.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210609_348B7C8AF09E2372.pdf
    • https://arzhosting.com/calisma2/files/uploads/jukuzab.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/64498637856.pdf
    • http://www.cbs-emballages.com/upload/file/2235006304.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9d9e73cdd---99988203046.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/db729d9t96lbgns3f4n06rau57/fajagoboz.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd12b9eff22---lulezajonobulugivuje.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/cd803b4bfd2ec1c7a9d81dccb4b57151/6756304673.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_off0000d9c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 16792 bytes
font_01_sfnt_off0000f1d2.bin
7438eec3f924c529330dfce3ae09370e4a87c7cf5cfae70fb9426a94bba0b5c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 17312 bytes
font_02_sfnt_off00011e32.bin
4a119c11c8b37ffdc3ae355bac87bf3f3fd130261f916d8022ba70863dd1aec2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 10152 bytes