Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4519286222b23e…

MALICIOUS

PDF

84.8 KB Created: 2021-07-14 01:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c611f7511ecede0190fe3ee888d996ab SHA-1: d14ed7014bfa15a6b432ed386b09eed67cf4fbe8 SHA-256: 4a4519286222b23e4c2f820505b12ee82eebaf12395d295e16dcee6b0c0084f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised websites or domains associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=baker+cyst+differential+diagnosis PDF link annotation
    • http://begemot-rus.com/uploadfiles/file/2021070812463173499.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/48521483081.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6ee21aba7a330a98f5071459d73e40ed/55170469218.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/14449274620.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/25519846923.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b330dc6f86e---72259817332.pdfIn PDF document text
    • https://argumentua.com/i/file/23074741092.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/bozitusemuvapon.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c4425d05---vilogulezazikazudijotux.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/20983798916.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/96316781352.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0ffeade2c4e9608d17cbe91e6b837ff6/65579733660.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622400997.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/17396798265.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/62b5788965e584b3aa15b82b0f93ecc5/gukugisije.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d4a06fe5a---noxudus.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ddbcdff8---kufapuvovamexa.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/75764327034.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160917ed8a4e0a---pajapimatibenolu.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/40512058435.pdfIn PDF document text
    • https://istanajp2.com/contents//files/26504327302.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/45934871427.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28c7c3c873---4698383152.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_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 10912 bytes
SHA-256: 0cce9659b2e01f9911269d6f3b084f74b41505adc738575cb425263261c4b04c
font_01_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 17140 bytes
SHA-256: acbb8505a18390d92dbd7d25db102fa9cd6f2a573646034ba1b14fffed616bc6
font_02_sfnt_off00012c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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