Malicious PDF — malware analysis report

Static analysis result for SHA-256 354721cf495f85eb…

MALICIOUS

PDF

95.5 KB Created: 2021-07-01 23:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdba1986758f2980db0d8aab5162c02e SHA-1: 074452bf9ed9323c185373144bc784f6714525e1 SHA-256: 354721cf495f85eb33a02e4b6c0f18bc07700415b7d280aad2c6cdb687656057
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs hosted on disposable or compromised domains, likely to deceive users into downloading further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://gbagencement.fr/uploads/file/28484199463.pdf
    • https://rumputhijau.com/contents//files/zexilovanezozidimipe.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5cbe5b93---milomekodedomamaxagakize.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/f79dcb7f10e1ee368abd9dfd42060fc7/48334805273.pdf
    • https://grupo-kayros.com/userfiles/file/fusobalilezo.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e286c390---21387162641.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d6037873a1e---joriwunodobefawulobijeme.pdf
    • http://plafondchauffant.fr//img/user/file/50864115685.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3088d7b76---bazotoxobenozosemasafo.pdf
    • http://polimak.pl/userfiles/file/jeximamilezexapuruzironi.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9e36f1ea6---8448647238.pdf
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/gogovobixalogosuronex.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/xureramekesineluda.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6d81755b---bomigivafu.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4384c4853---91144492916.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491bb6d066---90448802748.pdf
    • https://tecnicadovolante.com/images/file/xepatiletemetovozeteka.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf16a288f78---61318894783.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fc430bad9c4a3613f4a5fbef27bc4978/26099007340.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3f5e63854abbafbe825d836eb7c5921a/bevamogijegakotev.pdf
    • http://apcmagon.com/userfiles/mozude.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/77ca195c05b0b9b594efebab94193be8/95174751013.pdf
    • http://banghetretruc.com/media/ftp/file/mefixilaxulavanelivivaz.pdf
    • http://planbmedia.hu/files/48928320951.pdf
    • http://bbdecontra.com/userfiles/files/nodojivumik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+san+andreas+text+file+download+for+pc
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f960.bin
93562409806db83650cbd00add2eb447197b5959da8961377389119ddb496335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 17740 bytes
font_01_sfnt_off000127d7.bin
749b317884a031f54071c61a83bef3563bf9a77f4323b98e5139fa175cf3ceae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 10840 bytes
font_02_sfnt_off00014118.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14118 16792 bytes
font_03_sfnt_off00015925.bin
16105b2a9ed84ab56a33053395e24b84724a238b20e3a85003db7a0e0fe6cfa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15925 6384 bytes

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