Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79031891ceb7505…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 09:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0815514944290c86b880ea43596cb9c2 SHA-1: 05465543ab60061cbaa5e054f59d175dd7c535ef SHA-256: f79031891ceb7505710af439ff7e8d151d654de13272db83115d75a09dba34c4
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 external URLs, many hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links and the use of compromised hosting suggest an attempt to obscure the ultimate destination and evade detection.

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 http://ahkjt.com/upfile/file/jofikedutavebu.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097a85be7fe2---miwikudijed.pdf
    • http://kapelski.pl/userfiles/file/zasupunogageximafanazuzib.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/48tt3qmr5grrb9sr8judl5ogc1/sugumutobonutosuledavav.pdf
    • https://pacpartner.net/images_client//imagesfile/47295862923.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/950f0244db7622aaa2a4005a73183048/36634904374.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824652a01d0---78600170456.pdf
    • https://osikovo.eu/webroot/img/content/files/rowisovoku.pdf
    • http://magogaralbamoble.com/galeria/files/wewojaz.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae063d634---46720332989.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/25b5349be0b3805efd204dabe521dc67/lorufoso.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/8u70i7hno70bsef4cfejujn8r8/zegar.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607887439eced---vejotobefotowokimonapego.pdf
    • http://teerosy.com/ipp/images/uploads/files/puretet.pdf
    • http://bestbelly.org/content/files/files/96487159225.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070857372d2d---wunutozerebavexodewobo.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35a1356489---budutupeju.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f5bb3a69fa75af15781e58cc903a72b/18817542694.pdf
    • http://amphorabeautyclub.com/campannas/file/60669378627.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6150c6780---71194784223.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/5f2110484c05465994c026ea50d57aa3/27452653499.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8ba24eb6---12354771461.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9e49e5f5---peduvuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=notice+of+zoom+deposition
    • 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_off0000eb83.bin
b923f3cca18f211cb6d7d6e8b312af762c10b12694e9e9054437c5faa16f706b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 16764 bytes
font_01_sfnt_off0001170f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 16792 bytes
font_02_sfnt_off00012f26.bin
6cfa33522867a2279ab73392e977534aa39c63f9d919fa57c533a1dbad5d2d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F26 10508 bytes

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