Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a2dd05fc9b17c5…

MALICIOUS

PDF

90.2 KB Created: 2021-08-02 11:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eaedc0f699551bb5445c14307b7e1ab8 SHA-1: 023f5f92332a981637bf07a2e0700646cfc109ab SHA-256: 53a2dd05fc9b17c58e62f9c35dce6290fdfd88db1eae8839bd1fad4b7d12d590
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://tasteofruraleurope.eu/upload/File/12454208067.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15141e45e---30519540773.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/92176275653.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/45480764153.pdf
    • http://alituncer.com/userfiles/file/vejig.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee939c443d---dobumawojom.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b055f0c7e2e---nigiwagixazanelotapa.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9191aa3ba1cadf6f76a84ddeaaa82692/gulunovovumexef.pdf
    • http://faradbox.pl/files/file/84305874565.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/f3cpieiu18q2b8qbtkhkmmhrl3/kasigebefojasilipamaban.pdf
    • https://dalton-english.com/userfiles/file/wuxopukavojijivil.pdf
    • http://vuonlan.vn/data/upload/files/4485269377.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e25b966f---finaluzonagumeradigakokix.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2af33635894affb1a582ac07ae9d169a/6627728366.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/tasujesiwajomiduwar.pdf
    • http://elazentrale.de/images/uploaded/file/50571523764.pdf
    • https://a2designbg.com/userfiles/file/jitetazeru.pdf
    • http://hdurmuslar.com/images_upload/files/bokoxowi.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0e293f04---vosoxe.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768263ed32c---87678291413.pdf
    • https://kipass.fr/userfiles/file/kosalipozuvavowunut.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/931aa8942458766b3f189435897fa029/ladowevenuduvubu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+youtube+workout+videos+for+weight+loss
    • 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_off0000fc49.bin
869b33fa9afa592d3ae93e12363a235bd2e362dbb72b5f746f86ce5bc11ffc9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 16856 bytes
font_01_sfnt_off00012807.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 16792 bytes
font_02_sfnt_off0001401e.bin
0b293a29ffa26f0d366ae744ad08c4eee9fa1fe76678066cf1dbcd711f051d57
pdf-font-stream PDF embedded font (sfnt) at offset 0x1401E 11020 bytes