Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79a2804847e287f…

MALICIOUS

PDF

84.5 KB Created: 2021-10-05 04:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 21d934ee8b6588acbf9e5ed3c0130b6a SHA-1: 47555f9d7951af92eae9226daf60b66feaed4730 SHA-256: c79a2804847e287fb0aa5b6878ad1d74cc47a9d63a56817bdd64991f8785aa08
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms. The embedded URLs suggest a phishing or scamming operation, aiming to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=french+revolution+class+9+pdf PDF link annotation
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/74415299018.pdfIn PDF document text
    • https://quizai.com/uploads/files/xalejarodimugozejeve.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/86575193163.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/giwijilami.pdfIn PDF document text
    • https://italvaping.com/file/xodorijizuku.pdfIn PDF document text
    • https://eetravel.net/file/73499415683.pdfIn PDF document text
    • http://nfc.soo.jp/file/tobegipamodib.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/62421685007.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161534dd9a0542---52055634806.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/linogov.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/pafuxakojifamalazixib.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/desuvebure.pdfIn PDF document text
    • http://irc.kz/data/content/file/17342076817.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/wabixik.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157322a53b0a---92530591909.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614417b7dee65---97825148461.pdfIn PDF document text
    • https://jobtiara.com/files/files/luzotutobaw.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/lukubidokizemimoduvu.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/lozaguxenenep.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161515e91452ff---25050010263.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/kixusaxudajaniporakifuk.pdfIn PDF document text
    • http://thegioioto.store/upload/files/58985949836.pdfIn PDF document text
    • https://premium-house.uz/images/file/robadevutinatovara.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_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 11028 bytes
SHA-256: 82b229febc6154084ac668dfbdb1b020e3f9fac252f9d8a428ee2763b1dd98aa
font_02_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 19008 bytes
SHA-256: 3df9c03d9a667951034af63ddd4f27a467616802603e7f7f3f41c068a6ffe73c