Malicious PDF — malware analysis report

Static analysis result for SHA-256 248c527785a2ad41…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 22:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42932994b9ea7fcccafb640a74a6f01d SHA-1: 178b1aedb0f41595261ef1bf7d4259528ba6a154 SHA-256: 248c527785a2ad41e98e7128892ae3f130f1093e677c51db9a52ff522bec8fdb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host malicious content or redirect users. The PDF's structure and the presence of multiple external links suggest an attempt to lure users to external resources, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc39caf72f---95653935593.pdf
    • http://osc-pribor.ru/products_pictures/file/69462936979.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9e27bac9644c9eb4d51f483fc6e2db3c/xesenedigidezikolo.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c30846237595f27a3464045b4995576d/patube.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d16a0a43a4d84d9eb8d14144ab132efa/delafiz.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e932edf562---bulipuvesezumapike.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b8ca813f4c5ea50c9e383687071958d7/mukoxa.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081268b423e3---dafek.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768927b922c---86514190059.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/euoehsp802sjd5ebq5fhfhkpa5/8087083470.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/euclv7g3g3dmpuqmnvjjt1nht8/61738339775.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1169539c2---kuborujitijobotuxomajirad.pdf
    • http://21cedu.com/pds/userfiles/files/25338932151.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0b58bf11849452a3233b2069680d2571/desodiligemumi.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf73edaf0c---robedusuxadolegol.pdf
    • http://breakevenpoint.pl/uploads/editor/file/levig.pdf
    • http://omonetach.pl/foto/ilustracje/file/sidusemonu.pdf
    • http://airfa.it/userfiles/file/bizawijoxapazov.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070caa47058b---81790317004.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/0m7hov33l0t0m4kdp7tune706u/57763355875.pdf
    • http://albino-pitti.com/pub_img/file/41277531695.pdf
    • http://wojno-stal.pl/pliki/file/kulivuviroresozafozujikif.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070036739211---kuduvo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=agriculture+entrance+exam+questions+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e338.bin
435f7e28d8bdf32c596ebe124b9082e870a531277f0adf62c163750c5012b315		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 17552 bytes
font_01_sfnt_off000111b8.bin
af3d885433dc6a3730effcad4ef6891a91abd2986c4c351e3b4835e458c0a8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 16404 bytes
font_02_sfnt_off00012815.bin
42e3f0580e1e3c0827677cbd930a72fa8396952862056e2b92159c986ba4666d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 11128 bytes
font_03_sfnt_off000141ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141AB 16792 bytes

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