Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df5507c82ecda77…

MALICIOUS

PDF

101.8 KB Created: 2021-06-27 10:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e946c5aca50e6b4bea96bcd12d00b718 SHA-1: f22ea8afe0cedcc5b24e6f3890d0ba08d7340f12 SHA-256: 1df5507c82ecda77fe7b485f5ae238c38d3081bf6f4642397e77cd001ad91b1a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be redirecting users to potentially harmful content or facilitating further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://inwebjor.ru/uplcv?utm_term=biblical+meaning+of+38
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0423a7efc3ea11872f17a645db5ec240/30125856953.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/73a45d1349ee1ff964db6bd82819d49b/78784146547.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4tfcd4ckjcscggn3boplhuieo9/sixepukifapalopubuki.pdf
    • https://ferado.vn/userfiles/file/natulorisu.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/32250121204.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bbhgfk8p5fki2ku2b1qvuj1sf6/najatowoduwijokesuzulabo.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b673cd7fb---gixiwuk.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/vakobajarimotiso.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/959366e048942796c497861997bb663e/bedolaxafiwakuluvar.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a635fbf8---88749696213.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8be3ece5a---batilofudixon.pdf
    • https://tskrea.com/userfiles/file/17244761124.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf5d79e66---55346402541.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab35bb7c816---jizejonalakutovo.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758d1caa63d---87746957094.pdf
    • https://magerp.org/upload/files/6685040780.pdf
    • http://metabolit-plus.ru/files/file/31360922072.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160803d65077cf---dutosowemokakajuraw.pdf
    • https://computerzone.pk/file/44296821725.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/6cbuiq0pnajsd5uhh3m7ljgjij/17159817859.pdf
    • http://119pump.net/d/files/52805835318.pdf
    • http://malbreil.com/userfiles/file/26894531733.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5671cn2uj43t95bfpojk7edubj/fabewoverunazabitujudupo.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2d08198b---67564759210.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_off00012cd6.bin
5ca0d65fa7054669d6595f6234bdba9c6547706ebd20740793a6530e40833937
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD6 16936 bytes
font_01_sfnt_off000158eb.bin
c22a525b0ceee427197206f89eb4ea46835e34827cbe6827e5dd63c291e07840
pdf-font-stream PDF embedded font (sfnt) at offset 0x158EB 10888 bytes
font_02_sfnt_off00017221.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17221 16792 bytes