Malicious PDF — malware analysis report

Static analysis result for SHA-256 76164d1c29e96af4…

MALICIOUS

PDF

88.1 KB Created: 2021-07-26 23:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1b00a0d999ee194991120e4c1bddf0a SHA-1: ba4b10af967afd5ac85a3ef027f227f887d5f504 SHA-256: 76164d1c29e96af456a1aae784049e3b781b07f48ecace51ba67e76c8721d428
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9d7567ff481c58536c01251233a7f3e0/fusetosusamesisakoj.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/14750281224.pdf
    • http://mg001.cn/upload_fck/file/2021-7-7/20210707031219178607.pdf
    • http://sun-green.be/ckfinder/userfiles/files/30120966504.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6a5f73154---somekodikokum.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775389b96f5---47259110335.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44a0b5e2e---vutixubakurasebizagebatal.pdf
    • http://clarasonic.com/upload/file/64883432568.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbe05f9b9---gufolarugibirexo.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106050734581894.pdf
    • http://jonkmp.nl/img/cms/file/natikoxapudesoxegisiso.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4q9r7pdnp14h8ui5vdt3nej6g6/71157029793.pdf
    • https://himalayanthailand.com/image/upload/File/63822929266.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073835b27373---16821986860.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c37453b0229174038b8a636779039245/dazinakewodeb.pdf
    • http://ajtoablakcentrum.com/_user/file/toxemedazodujojevu.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c0a1bb8c0962f1252b3e1326b0e2c8e8/lelozepigogavo.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/71395847414.pdf
    • http://mths1965.com/clients/6/62/626de2090e8268457c7577d5e8b87900/File/vamesitozubadamimak.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b8c50e829---10552512040.pdf
    • http://ya-ke.cn/admin/upload/16000255079.pdf
    • http://bagliodeimille.it/userfiles/files/limabusakupilekiwonaxidog.pdf
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/79449050938.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a591500691e95b844969cdcf85562b83/zexoj.pdf
    • https://giustofiori.it/file/32786425991.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/95659847abd0283436612739ef85a0b6/89781215536.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+big+is+a+3x5+note+card
    • 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_off0000f290.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 16792 bytes
font_01_sfnt_off00010aa7.bin
73d1bc19185ced5224824329edf812378cfa4487172c0afc4f85ac68538bdfa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 11124 bytes
font_02_sfnt_off000124a4.bin
1a61bf39bfa8c08cb86403cd3e804bf12758e22030aa7b1a83e2147b5f9beadb
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 17220 bytes