Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05930da907af043…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 15:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cb395377db5937fb6b1fe44b3c4a294b SHA-1: f466d05dee4bdf5f22a1622b020c9af5c92001ea SHA-256: a05930da907af04322656aabab57892cae805169d99fd48fa623857cebd4b5a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=formula+to+find+the+measure+of+each+interior+angle PDF link annotation
    • http://mkpstroitel.ru/upload/files/15422985175.pdfIn PDF document text
    • http://sakra.sk/storage/file/50783300640.pdfIn PDF document text
    • https://jss-moms.si/upload/File/totodugovijaxezodenis.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16150e071208eb---92014457309.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/28004609027.pdfIn PDF document text
    • http://clickvay.com/upload/files/10187973581.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/misetuxanexaxivixuva.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/73842020234.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bugerev.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210923210046_i5hona.pdfIn PDF document text
    • https://mediaskills.rs/files/82598617737.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/58114129693.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091902522173499.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161583564aa47c---99839325302.pdfIn PDF document text
    • http://generoussecurity.com/uploads/funupadogakofulelolifaj.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/96111419046.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b7630b63f---72208815696.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/tokatupalalunaba.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/96342ac33f723f3269f685415a3b52f3/27190963525.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/45572074004.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/44934945466.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/44501922630.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/95567506669.pdfIn PDF document text
    • 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_off0000b1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C3 14776 bytes
SHA-256: 416e8275ee6b7d175321e07756806d01a97296c7904fb83955da5808d92bd6c3
font_01_sfnt_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 11000 bytes
SHA-256: 972ca0f7d6c1d264a2f0599bd2d31033374a7f1b20b365ca026e630106951df2
font_02_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1