Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c03ac81ae6960bb…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 11:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80842bb00613c0a6540e39159c950050 SHA-1: 71ed6ae232fc36312adda29b3d44ad1b9d4683ff SHA-256: 7c03ac81ae6960bba4c0c6d2ae71cb6df2c45f743b8821305a66975e41e12b86
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://synerhu.ru/uplcv?utm_term=sky+game+apk PDF link annotation
    • http://muacuoi.vn/Pictures/files/pumuzu.pdfIn PDF document text
    • http://ihdbd.org/upload/files/xepewej.pdfIn PDF document text
    • http://wernitznigg.at/files/4058051223.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/gufexedanemejewinefado.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/89963860177.pdfIn PDF document text
    • http://ecole.ru/text/images/file/93157819938.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/legovanekakirizakut.pdfIn PDF document text
    • http://ipceurope.be/assets/file/kapemak.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90495c063---doxelubume.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161310e6dcecfc---94812536933.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/suporu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/18sj63ka2kfailkrdo7cqj0lk2/bubaxowelelopupelapovobod.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3c2cb5cd---46019167488.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/32347440149.pdfIn PDF document text
    • https://fishuntpesca.it/file/misewibizesugipef.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/gomukerova.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/74599782371.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/68873179699.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/lufekumirosexomiruvutaga.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a8753f86b96848f47b2761703347e47c/zoravep.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/92743136991.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/xirupaseger.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a143d22bbb637d041e8795ba904d6910/lametinewoxek.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/sakigodug.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133956cc0a57---11043681533.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/334b2026eece52e3477c00c41dece5d0/53037357265.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 10148 bytes
SHA-256: 7f2f0e028bb749aa579220db252610a7319f430a03a05867299e70a17f21d29f
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 19280 bytes
SHA-256: 864f8e61ab326cba5e80fe0642b28174d0f3fb888c3ab462d6d48889ab92390a

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