Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad8249794ea0f78…

MALICIOUS

PDF

88.4 KB Created: 2021-06-25 19:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf61511f45859476cb3b0d2d48b98461 SHA-1: 2a522d15331b8cb78549f9d5426d2dec54f3173e SHA-256: dad8249794ea0f7865e6a0e04fe5ba21c9debd73d6b4e177ff553085974c5fe2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of disposable hosting further support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c56664d83---83588323413.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a94c44ea41d---31648729230.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843b44b65b8---zogikibobijulokukobu.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f84fa74ea---4791902183.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e40073466---31107519296.pdf
    • http://ahcxdq.com/uploads/file/032012564386.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5336987aa---82868078842.pdf
    • https://xigmatek.com/upload/files/sufelomenu.pdf
    • https://datajournonepal.org/files/dedifipotikubebonenib.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76082d50d---figesikivuganubepof.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0cdf214bd475fe221c0e22357b25b4ad/mubamed.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ef74961f3203ae35c194328d57bb4a41/saxixopufirokatiga.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e445d74f66.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef199b122f---muwakedot.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bdc3b3990---kafefoparatuz.pdf
    • http://akcjonariusz.com/UserFiles/file/50301998562.pdf
    • http://chikatere.com/Upload/files/wozevagomugaxunira.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3a1b564d722cf4040fd1bbab2b23de25/70184076036.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081212cc06b9---banaxas.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e959941141---kasulawivuzanojuperaxaw.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a585f543d05---50361512214.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1b7648cef22be58d941393012769ebf5/rulilepewinel.pdf
    • http://csc0851.com/userfiles/file/20210614010909_wyc6ei.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=henderson+fixed+interest+monthly+income+fund
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/15b5c12c4e9bcb4d57c7c31e3d566fad/difilofakarexedo.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_off0000f5a7.bin
d365da5573248faedc49203e362b2c43501fec024e1c259d44f34ba3f7d5e324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 17208 bytes
font_01_sfnt_off000122c6.bin
2c1b375838c9d30d2dc7b03cd41df6cea8ae8ea782e04749cc991753efd3f81d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 10884 bytes
font_02_sfnt_off00013bbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBB 16792 bytes

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