Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdaadeaba652b573…

MALICIOUS

PDF

75.8 KB Created: 2021-07-10 10:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82da796af2cabd7ddf27e4c2c7e9a4fc SHA-1: c308f15a980ec4fd42656d97128453f05974c840 SHA-256: cdaadeaba652b573bb2f67097277bd4219ba327acc2d33c4a469d487b0665262
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users to malicious sites, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mwflower.com/upimagesfile///kirarow.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087576a5fef9---laxemef.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63cfcbfe9b909454a3471c77cc4a3b46/4424051405.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/jikexan.pdf
    • http://tincorner.vn/uploads/files/suvufonabavapizewitab.pdf
    • http://www.sport-konyv.hu/userfiles/file/67142224616.pdf
    • http://mevlanaasm.com/resimler/files/jodabasadutatofajafalefo.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/61383a62378d5597be18442773d4c943/12983096323.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2da0c1de52089d49bb64faaecd5e074a/vabif.pdf
    • http://ampletrekking.com/userfiles/file/xotim.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca0635975---mufazete.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077464a869e8---paxitarigov.pdf
    • http://mariopresto.pl/userfiles/file/88188336574.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a7702fe8fa3927b38ae3418683355ff6/23212718904.pdf
    • http://bawaconstructions.com/editorData/file/22245588957.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608455d93880a---lokigobobi.pdf
    • http://smn68.com/clients/75339/File/30828672733.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e35abf171c0---65868122807.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badd9871bdc---wijenezalemif.pdf
    • https://nguoixunghekiev.vn/userfiles/file/1669702082.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0m9a72led6qq3nqt47pa5na1t9/fosovinajefatidelomefe.pdf
    • http://msinziniering.com/userfiles/file/gotokigodutuviwidulil.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/imnp2nv3fb5e97089422p967m9/dukanidisido.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=physicians+desk+reference+2020
    • 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_off0000c5d6.bin
7050c2bb29f36f05c9b3dc727d9957a1cd19fefb6dc1159b3d86f3b9a3d695c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D6 16572 bytes
font_01_sfnt_off0000f0ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 16792 bytes
font_02_sfnt_off00010906.bin
44f7cc4209688b14f98fe567e84f63e2356273c8ce497445f9e3f41bc25b16e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 10756 bytes