Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce1aecac745c5c7…

MALICIOUS

PDF

106.4 KB Created: 2021-06-26 22:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 387528d96b51ccc847b25257bd3b5eba SHA-1: a8d2ae5003ed9c0019d641b82b155c283010a29c SHA-256: cce1aecac745c5c77641c5f667886b221b144016f1403ae1ffc5123d99087655
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://nomylo.ru/uplcv?utm_term=housing+planning+and+management+pdf
    • https://angkalaris.com/contents//files/37756180754.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/butoropadaf.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/16930ccc2903498a5eff3df82c4b3a3e/walovirijoxemu.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/60ec612f152384c611d7e91250c13d73/rowavawefivowaxizemizuke.pdf
    • http://aep-tc.com/cache/fck_files/file/lanijipufuka.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/efs3ta8jkgob9skshljnrp81a4/81291725975.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3003ec5bec---74779642308.pdf
    • http://www.ecostroyservis.ru/File/porusakapefipugumuwitase.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2423f20e---zijalevedamivowes.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072cae437b56---53911102625.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e36e694672---gifefazumatogo.pdf
    • http://zrdb-drogbud.pl/Upload/file/zurevatab.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/19df3bf737513020948a926d731114f4/suvenule.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094bef520934---naragojuripave.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/qkcfaj9spn8qu8roo4hn1b18ap/77954361425.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b6a426e2c---81677877169.pdf
    • http://botosani.ro/img/uploads/file/63923472460.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8866d1edf760c71ff7d8868a18551598/muluzisifakore.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8175da500---77473864800.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609e74364c917---lepevubibisaras.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3ca4eb9jf8qrvv51tcfdga32h0/54738773301.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8lg5lgamvjk75nufvrqq00eutv/judizazazige.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c928848a8e---jozanilopewumiviboka.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2fedf3dd---52254828659.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cb4.bin
ec39c598df4042e1c9e7985704af3fbcb54d6a9492062c71b405f2d17d226664
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB4 17512 bytes
font_01_sfnt_off000169b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x169B1 16792 bytes
font_02_sfnt_off000181c8.bin
5cac2937850524d7ad771b630f780aeabcd43f17d646b283ced594540405be7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x181C8 10832 bytes