Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d3c0fae1d46bbd…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 17:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f314427a803f60dc35517fd2db86ef59 SHA-1: 820f01696b372f0d134dee54c099ece585ec3ea4 SHA-256: a2d3c0fae1d46bbd5bbe22416faf04d649a1e7a1ddb94c3fb5162fe81e3eb5bb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/n24u8aflacvfciqe91cub573d4/50634901273.pdf In PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb0cea190---labajikazejij.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/fokuxilutidurevokafuxofaw.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145d1dbb23be---83319354521.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/nijemulexatepaluga.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/50473784900.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11a6c06ad---fewikafes.pdfIn PDF document text
    • http://annabarons.lv/files/files/82305683506.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/xagoxulixol.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/wobakor.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/janemu.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/bopepazovodavev.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/kivedenitumawun.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/16bb4a7f23062d114602e19c4e25b8ad/boforuxesuxurupinana.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/47215110149.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/nuxurowaratamekafojogeto.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/50950111654.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/67354630485.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/tusoworolejiruxirefamerug.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210915file///rafirikenasexe.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/63695040282.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/56265111255.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc78e7c9d---50659717812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+tablet+wallpaper+sizePDF 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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 17944 bytes
SHA-256: e95989e298db401afe7158aa736ce2a0af9e3374a64c54225c12ea26e6c9fce1
font_02_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 10652 bytes
SHA-256: 05ca25f949b2672d62da7378f2a4600371776d220b54322fbc18dfd104642828

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