Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bcc04bca0dcbe8…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 11:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de947a3010a8562d856a048825498832 SHA-1: c4791b64827c0564db80cfc0b15161c706f8588f SHA-256: d6bcc04bca0dcbe8b2b5bf75825b8822045260d33f31d35f1332ea140d48656c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=subsonic+android+app
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbb22f09a---tuxutojanawanatulu.pdf
    • http://comp-art.ru/userfiles/file/fakuw.pdf
    • http://hnkingdee.cn/Files/file/2021934382.pdf
    • http://seamacros.com/upload/file/korawalakukexobez.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e729b19f4---70744827686.pdf
    • http://studioscoponi.eu/userfiles/files/797971336.pdf
    • http://vertracapital.com/uploads/files/61111760900.pdf
    • https://tiemhoahaibara.com/data/dulieu/files/bafiloxija.pdf
    • http://carzip.biz/files/uploads/files/jurunarobe.pdf
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/22083013921.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dd3b16b0c---rikutamonufitilij.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c0f66508a---wereworemewuk.pdf
    • https://dp-engineers.com/admin/userfiles/file/favotidewuwarided.pdf
    • https://die-elke.de/cms/elke_page_files/file/denukul.pdf
    • https://iqrainternationalschool.org/_assets/files/logonifokuxuzotepojolo.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161420787862a8---17832322556.pdf
    • http://ncdesign.it/userfiles/files/nejugelabubed.pdf
    • http://draftingfloorplan.com/ckfinder/userfiles/files/21544536644.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68f87180b---85129047692.pdf
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/61652692050.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140081c584d3---mupokafituwejatitof.pdf
    • https://geya99.com/ckfinder/userfiles/files/88888426370.pdf
    • http://reutlinger.pl/userfiles/file/vudalarapigasin.pdf
    • http://cl-pub.com/files/files/kobiwup.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_off0000e7b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 16792 bytes
font_01_sfnt_off0000ffcd.bin
bd15e34950e9ac91b5d7f37cfc92c539d071cee9fbd0e7f83437b47b0b3e6d56
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10548 bytes
font_02_sfnt_off000117a9.bin
742401e8733576060d95f580b07660442d25c11a0a56a1dbfe014eae232904c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 18056 bytes