Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b4d39a239913df…

MALICIOUS

PDF

89.3 KB Created: 2021-07-14 04:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb4c029e7c0ee917863fa15adbee14e4 SHA-1: f8f84a1b57bd0509dc21c996a54e776bf100cebe SHA-256: e8b4d39a239913df5797aed6a351ee55fc414d4cc1f260e6d6a100ba6c2066a0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF exhibits characteristics of an advance-fee scam, using a link farm hosted on compromised CMS uploads and disposable domains to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in fraudulent schemes. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://attack.lt/images/files/jupajapes.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8c431165---punupaxagomazuruvowosizow.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160731de90ed43---sikejavenaziduxapowalo.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26de6337d9---xakisatulisosixe.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f64de451e1---98215990599.pdf
    • http://www.knickmeier.net/images/pageimg/file/xogamiwiruxewezu.pdf
    • http://singlesync.com/userfiles/file/14632780440.pdf
    • http://dotbamboo.com/file_media/file_image/file/30959709095.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/23d948e5aac0cf37c5dc1c0e9ae7a701/61668140292.pdf
    • http://adacu.org/userfiles/file/20210615190219.pdf
    • https://viettincapital.vn/upload/files/46512482796.pdf
    • https://247christianity.org/fckeditor/userfiles/file/50508785351624815282.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/668f2eacefbdb9fa5643594d89ccdd5c/bawelunijolosuwa.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/15m02q9v7qm9dcj37epnbvqap5/peluloxutox.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4001pdjdtqd642lkvok2ll4615/dofujebesibijaratosuda.pdf
    • http://siembra.me/uploads/files/zezaropexedelogamotisesev.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ffa1d977c2d33c750eb096464bfc6786/90788800543.pdf
    • http://mulroyenvironmental.ie/userfiles/file/64731691979.pdf
    • https://edarky.net/data/file/vamepoxekotawarov.pdf
    • http://envigest.cz/upload/file/penazatevejaw.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3dc9dce3---62177425405.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081f569d9f5f---vexotanomefubonuru.pdf
    • https://aymsoft.us/aym_image/files/laruzusewuderak.pdf
    • http://sys-svinding.dk/userfiles/file/49924774104.pdf
    • http://brmhn.com/userfiles/file/20210629140403_77lhmx.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=easy+solutions+books+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_off0000f921.bin
f1c26b849322eaac77e9bbf739f845b0898a4b1eaba7fff607c24090e9bd93ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 10688 bytes
font_01_sfnt_off00011186.bin
0f296c8ddf505efd591b940eba9abcb372b5c8e88143dcb07d94fa064155b9de
pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 17656 bytes
font_02_sfnt_off00014015.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14015 16792 bytes