Malicious PDF — malware analysis report

Static analysis result for SHA-256 117d6f915c8040f0…

MALICIOUS

PDF

114.1 KB Created: 2021-06-26 21:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68c92f12a2ab7d31555ea95afe1698ca SHA-1: a7487aa9bbbcd83e4c068597ef87c6713058f77b SHA-256: 117d6f915c8040f06e7e17892fba7c790389ebd966b3a0d4164050d3d6b4a975
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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 https://coretry.ru/uplcv?utm_term=bioprocess+engineering+lecture+notes
    • http://nhasachnguyenvancu.com/Images_upload/files/347045924.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/regidakuximenurali.pdf
    • http://bearings-home.com/userfiles/file/lavotugatirufepeburen.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j78hfom26tfrtgja14g6m87tvl/jutuzop.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fnd9ke8o8t9omb1956cgp14lr7/gasasaxisimexudifoles.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/10ef5b27fbe1c7525bc83002984da9ec/nikudaxulefapowufapafivu.pdf
    • http://ahkjt.com/upfile/file/gafiwamu.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4e771ca2e---40786226071.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/b6bcfc0832c2237971f8e40d525f8625/nigamago.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c556188b1a2---simevefukitip.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fde69867---68730560427.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4255363825e167a6ce251a6e5daa7b60/juwizijakate.pdf
    • http://aucoindeshalles.fr/menu/file/12095256936.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6es794hae9f7fdndq8nhg38tqn/25872277319.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80773e5c2---sivijimubajilonij.pdf
    • https://ivanamihic.com//files/649436916.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/bff22f0754071290a297563c935cb22f/68470319503.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a9f0ee37354a618156974efc305592e2/mavusekabelakejupivevit.pdf
    • https://murtenhof.ch/userfiles/files/fosusupelijaso.pdf
    • https://majorsagilekvaros.hu/uploads/file/pojubozepufikup.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fb6b98ca6---barasuri.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/pve4r5krb976ob6biim6l2brv7/webesoxigerovara.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rub0rqqujhqqrt3pv9hfd4iap3/mixojukexoxivalusab.pdf
    • https://tese.in/ckfinder/userfiles/files/27700738112.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013caf.bin
32f52ffdaccdde08a99667fada12087ce44a5a576e0ebe9b6306bae5ed7d30ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAF 18116 bytes
font_01_sfnt_off00016c32.bin
34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C32 16168 bytes
font_02_sfnt_off000181ca.bin
dbe667bfd3ed7620f7a4c775e6e084fc7bea7ff1f61984d6927d9ce4a0ea77a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181CA 10540 bytes
font_03_sfnt_off000199fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x199FC 16792 bytes
font_04_sfnt_off0001b1d9.bin
6260c3b167456f78ec062f43d698cd08a20a5af35f5e0a8578f47189b25fbcad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1D9 1440 bytes

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