Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1015ecf68b79a2b…

MALICIOUS

PDF

81.8 KB Created: 2021-08-12 09:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ff816f181aa573b96020a8c2409b041 SHA-1: ef3b6b597f7d7c29c3274e72b7c37ecc5a63d076 SHA-256: a1015ecf68b79a2b4c1db5d547d13c2438fe7a277e7e0b313ea6cd017a0d49bd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable or compromised CMS upload storage. The embedded URLs, such as http://conblocmanado.com/pics/file/29940206194.pdf, are likely part of this distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://conblocmanado.com/pics/file/29940206194.pdf In PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de62e8bce2b---11850107702.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d47d22843---derefoze.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/jesenabivixuxege.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1e68bb2428aad8699f68c76ece7881af/zepavejila.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/4546149383.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/ce9d26fc01ae748d885de3a5e5f774a8/labuloduvopafizozewapowel.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/farunesu.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/jeralamabuvepiju.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de827fec765---89607792670.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/85342074021.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/86907227693.pdfIn PDF document text
    • http://ilkemymm.com/image/files/50593955801.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/82044353478.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/zulapajidiribubop.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/21035081968.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/liwup.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2932f5d883---selimejubesobajuliba.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/vejufabokowunuge.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5185503f8---68279047490.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/53387199967.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/78388126727.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b05b467848---34540457759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=chemistry+solubility+curve+worksheet+answersPDF 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_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 11124 bytes
SHA-256: 65c4e343417413a32475006877233c41276fc69e64a06d848306b6235b7f20ca
font_01_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 17172 bytes
SHA-256: 3247bbb5af7279e28a40a62a18996c30e0aa921e7ba45ae73854f54d9099525e
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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