Malicious PDF — malware analysis report

Static analysis result for SHA-256 81eeb963d11d32c5…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 23:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 027bbc62576f9304c0577c3375fb3992 SHA-1: 4558310a38c90904b7ff0f50b3131bf5db3c2ee9 SHA-256: 81eeb963d11d32c5b69a49addef79f3ce8cdd7877146bbecc88f6a37d0497c8b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a link farm pointing to compromised WordPress sites, likely intended to trick the user into downloading a remote support tool. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded URLs suggest a phishing or social engineering attack aimed at gaining unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ketchas.ru/uplcv?utm_term=pouch+printing+services+near+me
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd1d6302d---mivevuxazugusaka.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/6q3pc52i5tk7dtc98sc5671f92/bibadazojaburawofu.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984cf70a69b---17179693454.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/99qcmb5jfasep0elkn1ccsr34s/86793124585.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/gcdo5mfol2edla5tj1caelvi25/33047861089.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/frla84dok2iptv4rdmt43sjpia/72208658267.pdf
    • http://alrabbancapital.com/file/files/vekep.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48812adda2---pisadosileworodidekowokit.pdf
    • https://actaviaserica.org/board/file/files/xagejotipasulijaliso.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbada476b3b---89962466678.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bf00e0e60cf0b8e10d1672bcefafdb25/39631276903.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/k0jdurbum7j5rb5hpjm5q4pqmb/71271442913.pdf
    • http://rotang.net/userfiles/file/falikowavakopet.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160920d03a03e1---razuzuvizurarowo.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095158301189---kesovadupo.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c878f7dae45---xebovupuzanegebisal.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079032c04220---36437535260.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/9817502208.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7e70fa3797468e8e20b1b4f9b4b7d348/sekibukov.pdf
    • https://parfumzone.ro/files/file/82186328804.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df80d8132d---widojosarivonarafiraw.pdf
    • http://minhphucvietnam.com/uploads/userfiles/file/wutenedenazedute.pdf
    • http://bezagsecurity.cz/userfiles/fuwibarawufenazu.pdf
    • http://bronia.org/userfiles/file/14139945677.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_off0000f0c6.bin
510c2e22348ed0ca4299ab6c77a97a0090530262569c7c3f94c956c068b29099		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 10944 bytes
font_01_sfnt_off00010a11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 16792 bytes
font_02_sfnt_off00012223.bin
ca97c2dc33ecde2daf88994fc34787a9acce19cbc8dd6d2ca7ca9677b4689b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 17596 bytes

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