Malicious PDF — malware analysis report

Static analysis result for SHA-256 0915f70b9a9ad864…

MALICIOUS

PDF

115.0 KB Created: 2021-06-29 09:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f0d3c20321a4892d2e92b4e1809af75 SHA-1: 1a1b071908fc292eb002b3e84908c13f5fd25352 SHA-256: 0915f70b9a9ad86451447ef65bdde7d0c4cb5239067558f631bff67ba25ef351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of these links and the overall detection by security tools strongly suggest an attempt to redirect users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=green+eyed+tree+frog
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f2711e46ab34d5b60671a63b0b9019ed/52948043707.pdf
    • http://webursitet.org/Files/file/levezopetaxigowuwilebo.pdf
    • http://fsanaq.com/upload/file/210619094525111377i00h4r2gvsz2.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8596ba67---45760876989.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87749f861---zodukekexane.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bc9c25ca4---70065422054.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0600ed52b0---14208076782.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608208f367dde---momozikugagezup.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/9ndmmmicd035ss6ta28fvglhh0/23742890632.pdf
    • https://service-panev.com/userfiles/wenovivafupupizapolub.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cfeee7bfbaec38231dfa509b0bf07afb/56064628119.pdf
    • https://fenicia.uy/fenicia.com.uy/uploads/files/8993294795.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b22cf1bc72---vuwovapanebedotakagog.pdf
    • http://alituncer.com/userfiles/file/vuvenomavumorunoj.pdf
    • http://ciaooo.ru/uploades/userfiles/file/devosivokomin.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/42c7048d63dd6094f18f52070a2206d5/8223411002.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff4d91b2d---79584080979.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/hbsvirqn5bs090d7bnm7ueenpq/vulik.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/91767776123.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ogj88lv24j5i035jv0kmpqp0od/pibakosutenavoxag.pdf
    • https://autotronics.vn/userfiles/file/73563879900.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4810ebbc7---82276690089.pdf
    • http://falerisztika.hu/tmp/69131264768.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_off0001603e.bin
130fe78074a73f993636f9bcc8a172f2c6f4b4b3be57ca146c6295575cd8c0b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1603E 18232 bytes
font_01_sfnt_off00019055.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19055 16792 bytes
font_02_sfnt_off0001a86c.bin
1f3e11a30b339dae4fad5f336ad88b31b80b839c2d353bd10e301804ca693247
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A86C 10216 bytes