Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db93c58490ecd90…

MALICIOUS

PDF

99.3 KB Created: 2021-06-29 01:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f9a6e2f5aa2ef682bd5dddeaa78fee6 SHA-1: 47c759e380089a27eb77cb3486848f07c2f112c2 SHA-256: 4db93c58490ecd90120d4740e53dcccf316feeb6ab57ef21bf0cb7cc8e0dba5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. No scripts were extracted, but the structure and URL patterns suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mjsolankifoundation.com/fck/imagesfile/70101081598.pdf
    • http://agcslohian.com/userfiles/file/sobomuxesixesizovitid.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/6de77c3b979b79617e6e8801c4be396e/judixatetutowul.pdf
    • https://imagebeaute.fr/userfiles/file/45065248486.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85df0291c---migiketujavarosis.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3488fb51d8e3d58b9b03fc51a92c8071/duteku.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16073c7256a2a6---85246999189.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88283414c0---vetibunedup.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/647771850c8f7093aad4b525d243951b/39182769782.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1946c2ce55---8693617075.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2047e1498---99015334709.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16097e8225ab6b---21579454432.pdf
    • http://xboxheerlen.nl/userfiles/file/71511210638.pdf
    • http://www.moyekolodin.com/files/tepudusisisefaloz.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/397fb8ed8f03102932883831720a343a/pawozatugixabuw.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/93718549480.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ff6f09e7b5db65ca85b336f40e02565f/71985992929.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/89c68cf6c280307f0297021b4e5788c2/mijigigijupesasok.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0d1bdc3f8---fimenuxakileteb.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160716fc6545bf---zovevi.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/631e4065e4c3a0552008e6e8f29d93d3/fedajulirakusu.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/80575146410.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/nj5rngh7qujhlj55d283r3dfqn/tujajegal.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/e1ut6onkfss30ka6i9n3n20a35/wujapimavobibudatasega.pdf
    • https://uleiuri.ro/userfiles/file/wigebovenezevujufem.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607149bdb7e81---tapos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+complete+guide+to+option+selling+3rd+edition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111da.bin
00113b87aabf6da0459f492ec52f224a354878952b94362c0a1b563ef7ef1a77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 11140 bytes
font_01_sfnt_off00012b79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B79 16792 bytes
font_02_sfnt_off0001438b.bin
379838f8745e9b33f24f1401ea759ad8d57294bf1df9b478bb9014104baace6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1438B 17424 bytes
font_03_sfnt_off00017137.bin
2612ecdf16093d1474f6dbbb92c81d9a42d0d71f6e43e5f82b7be0499c9300ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17137 2792 bytes

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