Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d66d9115a1d6dd5…

MALICIOUS

PDF

98.6 KB Created: 2021-09-05 22:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abe9219e8a8594011e4b51c2505f063d SHA-1: 21ccacdb10ce83eaa18f3ee2d46fc82a55fabf14 SHA-256: 4d66d9115a1d6dd566e3ac038483cb3686d0ed2e94045e4d2d52279bf799ecc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external resources, likely to distribute further malware or phish for credentials. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are hosted on disposable domains, a common tactic for malicious actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=spartito+per+pianoforte+pirati+dei+caraibi+pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b35259864---38059103269.pdf
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/lawawajijonugezoza.pdf
    • https://sportcity.bg/webroot/img/content/files/nukavapuzal.pdf
    • https://globalmediaminds.com/uploads/files/96992530775.pdf
    • https://shipnhanh247.vn/asset/files/labudo.pdf
    • http://djapm.com/userfiles/file/82895538480.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5a9d404bb50391410ae25d8b22e669e0/nevawimipuvamewax.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d48054a70b3c1685187ac3e40678cb3e/varoxadoj.pdf
    • http://kco.su/userfiles/file/85399231177.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78299d832e---fivewe.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/vuzebulozitiruto.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/zovelugokevolob.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102f80c5666a---lunovuxajewopinugovuniwid.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s7o329rj0ehm4igefpl8r7dd4j/jimevewuxobegeburaj.pdf
    • http://ajivikafinance.com/userfiles/file/wuxewipesofonesevuluvuba.pdf
    • https://cncostruzioni.com/userfiles/file/59311653293.pdf
    • https://nestaerospace.com/uploads/file/23916927012.pdf
    • https://danielstrehlau.com/userfiles/file/7093043876.pdf
    • https://likeevent.it/writable/public/userfiles/file/85639903241.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/84gcor03djvqq2plbpjniuns83/2966750877.pdf
    • https://agrilaui.com/userfiles/file/40869550811.pdf
    • http://nanoservice.cz/upload/file/natufewapapanamadosu.pdf
    • http://dblbtech.com/userfiles/file/jitirepukagewofoleje.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9408a11b64bce93fa532738fb30a11e2/timefa.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_off00011a76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 16792 bytes
font_01_sfnt_off00013288.bin
a04323c10f566ab547a4218020cd5041255cd4e09ba95b68e8c1b36772e46132
pdf-font-stream PDF embedded font (sfnt) at offset 0x13288 18604 bytes
font_02_sfnt_off0001643e.bin
fbf0e26cc0b4f77f8cced8c2f692b6516fc1698e6aee395748e1a2bd15b8a31b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1643E 10612 bytes