Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb68c2c8c1b7b60…

MALICIOUS

PDF

75.9 KB Created: 2021-06-27 09:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a76d4943dcec821c22986f0c8bf0ee2d SHA-1: 4945912bd8c9363107e92beda77b605c5b175eda SHA-256: 3cb68c2c8c1b7b6093dbddf75553658d05beb38b0c0a25aef5ea0a6cd787ea94
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised or disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/50a0001714f92a2b12e14f7088b4cde2/52015020188.pdf
    • http://mimarkamilozkartal.com/userfiles/files/8801649795.pdf
    • http://omonetach.pl/foto/ilustracje/file/jumaximunerofakifodarof.pdf
    • http://daoltrading.com/userData/board/file/2786644522.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/990b1a4753c45aedfdc1fa0cc672eb54/pepakofuxeguvej.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/mkn6p1lrrki1fj679rpugaova7/18931435286.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc53749549---50234180082.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084af1bae166---ruzalazuxipiw.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160802a8b805aa---77553395465.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca29d49d27---46371254834.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/5agmenjs2s4gr2vkq0jqld3elo/jomadapaxake.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/1c5qrpl6jnqf9o0hm0csgeg6f4/jemixadefexobufonefevoge.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160824d9a8ac67---laruxejapelov.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2f358537c---nexive.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/uge0ungsjantkol8r7cp3uapa3/60310580214.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817e77de0cc---rosusejasukapunubidarov.pdf
    • https://tramtron.vn/uploads/files/files/tonegevimexifevuz.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4b354123---49393607953.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d6f5b095f14b6624756d69bb17d7c2fe/31861985826.pdf
    • https://ascinfratech.com/clientprojects/trading/file/87909157603.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/c81a6d46d67b94f1acf1b4a95d00f619/bipapesasiri.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7418aa6a---manikaxuxalovef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=asterisk+for+dummies+pdf+free+download
    • 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_off0000c514.bin
2d86f9097744a87b50ee1897166dd56f379ba4513d28400c19806930eed0c498
pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 10916 bytes
font_01_sfnt_off0000de6e.bin
ef5371b5f76deddd9d3933ca32824905c4e80fedc208e3492aa1f3525f34a862
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 16884 bytes
font_02_sfnt_off00010a34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 16792 bytes