Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a88ec5d2617d296…

MALICIOUS

PDF

98.9 KB Created: 2021-09-17 02:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d56cba24c78a28ea3a8d507f10c2b193 SHA-1: 62d8d3b255a3e3e0be3db2e6fb49e9ba900e7ee4 SHA-256: 5a88ec5d2617d296f0f96ca8840dddae5168dbbce9b36309d8f41ffa71417cf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites and disposable hosting. These links are likely intended to redirect users to malicious content, such as phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=watch+the+forever+purge+online+free
    • http://affordableadobe.com/ckfinder/userfiles/files/5597794478.pdf
    • http://china-miyaco.com/img/file/2021912152735.pdf
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/jumiduxoti.pdf
    • http://sgrappresentanze.eu/userfiles/files/43765582573.pdf
    • http://aadcnfgl.netsociality.com/upload/files/12991965177.pdf
    • https://best-label.com/upload/files/31753277247.pdf
    • http://pass38.com/images/contentimages/files/porunepinanif.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614207aa2f7bc---88379683722.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff3415b7b---rutekij.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/pvhqhdskjvu8vjbhf72ge60qqm/juwadorotisa.pdf
    • https://guineaservicesproviders.com/gsp/files/12068300586.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6184781731f1a32d8f63581954ed2658/70900736866.pdf
    • https://tarzminder.com/resimler/files/38105535756.pdf
    • https://regiefranchet.fr/userfiles/files/buratixugilujuworezaf.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/sonewide.pdf
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/panatan.pdf
    • https://ddshower.com/ckfinder/userfiles/files/51803945133.pdf
    • http://centronegozi.com/public/zulitotebelazavunuzud.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/n3oph0qorfgeddp9q1i03tigp4/77875601747.pdf
    • http://murielbellhomes.com/userfiles/files/21642396443.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/70636061640.pdf
    • https://stancijanegrin.com/userfiles/file/nafusefizudu.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e05294d7ac79723fa0b63755f9041bd6/newunanes.pdf
    • http://ozhelalikram.de/resimler/files/16083483175.pdf
    • http://grafichesirio.com/userfiles/files/jamonazanogepurigodowipaw.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_off00011de9.bin
9edc49af367020566b349bb075e0b5019a3c2ead899e0475a3692effa047237b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 10752 bytes
font_01_sfnt_off0001369e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1369E 16792 bytes
font_02_sfnt_off00014eb0.bin
441661770d78b13827df7ed99160c629e43ce84851a45a20a7e4c5ddc88d48d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB0 18200 bytes