Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e71105f09f5e85…

MALICIOUS

PDF

95.8 KB Created: 2021-07-24 07:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54c2388584e8bf16d66dbb204d8ad72c SHA-1: c4577351204c84603f4f877001ccb966ec020da4 SHA-256: b0e71105f09f5e858e6a61f4d89698cf0fe0b813c732996f0663e05d94e5e19d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting it's designed to redirect users to malicious content. The presence of multiple URLs pointing to compromised WordPress sites reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/9ae781ac8cd65cdedcda81a4d92faf13/voxebufarow.pdf In PDF document text
    • http://floral-design-lindgens.de/userfiles/file/31322707155.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5d461bc8ab8762a115fe10dc44a671d7/datoramakep.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/96382682382.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f5acbdd25eb576283fb47a41f1294c36/vewevowubofata.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8d59ac7b---63800827494.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/08cb777c891a6a5339a6391e63f92c3b/poluta.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5dc9a1eb89087ead7d79d8c51370dc64/96107677293.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/gaxute.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b9a1e7994469e169f1cdfae70bbb0938/82537922880.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/kumugivudiwovoziven.pdfIn PDF document text
    • https://0900107678.com/upload/file/36766967418.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a9e172d3e8399d3df01239e40eb47d89/vonesojiraxivovotol.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/e8ivdc82r2r9o15ktmfi3qa97r/xunibudibew.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/fa40ef4754423c3dee4481c5a0b52094/43957268410.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/20738773079.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/18397411206.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/87536413651.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a68c164a8---1479339658.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/54347529020.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/53370500557.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/vuwoledesunojubemoj.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vudubazawejemekubejeg.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/14141142927.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/qb6mm495u2h4515300skfd1esr/kujitofurotewufobekepuw.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607679879c966---68639583645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+gta+san+andreas+cleo+mod+android+nougatPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 17328 bytes
SHA-256: f4e75d0e046f58df0cd0e10e28571c47988c200b3d9c9a46508ce343c4d0c6cb
font_01_sfnt_off00013f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F82 10900 bytes
SHA-256: f2cbdea6f7298165431b4481a7a8d807cb9483b2d3b611677d6ed86a9a91bc47
font_02_sfnt_off0001589b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1