Malicious PDF — malware analysis report

Static analysis result for SHA-256 23668b5b1b35884b…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 11:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24e93cba496036a422d228099b8e2c67 SHA-1: 49259b857fd48f8805ed2b297652636413932b7c SHA-256: 23668b5b1b35884b7f5544f21082e2e43d798dbb2a2e765b5b67fe61ee634dbc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous compromised WordPress upload directories, suggesting it's used to host or distribute malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e157e586---luledijupute.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cd84e596---97491165900.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607673cd4cd41---7065516268.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nm4ot61dncpdb38cthfkm0603k/javesokilisupesam.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/637cd5d46e066940279d1964749a85e1/nevepebigugowigofuzi.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3624d1f6632e4083875654e626e3228e/69358912018.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/8126603732.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/da8972c454a7d7934ce37c52719ea9ad/88782409695.pdf
    • http://bannermaul.com/userData/board/file/13591847926.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609011bccb17f---31066225338.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/07ad7d4626eea4c299e0ca7832dbdc22/ruvewepixipizuganob.pdf
    • http://sewakendragroup.com/userfiles/file/82991668468.pdf
    • http://omgmediatank.com/userfiles/files/56077075405.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfed03d23---lidatixam.pdf
    • http://sakem.org/userfiles/files/61861103466.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739feb4cfef---86702114767.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12a08f06b---jepit.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cqcrjvgaqupoa715s3327u7492/93714069603.pdf
    • https://mayurherbal.com/userfiles/file/vebojumukagatujam.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084231ae9ba2---nadiripexujifamisakabol.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7108acbaf6198822d485dc8cc5e0f8d0/91978759957.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091cd9a8ffb3---12343704129.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd76e3ddb6d---2903579552.pdf
    • https://vanphongphampmc.com/upload/files/melux.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/soveb.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/bcr9v1mta2equ96uk1a45coh80/33457036683.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e6afe10b89c0c57c0818e90fed68f731/57617361382.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da1953287---wenebivikusefov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=a+muscle+involved+in+breathing+process
    • 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_off0000ff33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 16792 bytes
font_01_sfnt_off00011745.bin
0b11644da62b222ef15f0454bb4538b6c0ffe4af1c7a65046f44428afb62341e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 17780 bytes
font_02_sfnt_off00014574.bin
6beb67663fe8e7d39307e4cc898a59afb9f9146b77bb0bc68611346b7d87bd68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 11248 bytes

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