Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ec5dc5b1b90f26…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 15:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d16f8424bc2150d4907f94f9f64b135c SHA-1: 0bdf29f7f270cc447223e2f5b4a35570d9492f96 SHA-256: e9ec5dc5b1b90f26bc4e5b705f445f61997ce392337e5b4192dc5167a9a53659
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous external PDF files hosted on various domains, some of which are associated with compromised CMS uploads. This suggests a phishing or SEO poisoning attack pattern, aiming to lure users to potentially malicious content or exploit vulnerabilities on linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://haliburtonhighlandsheritage.ca/userfiles/file/75914369296.pdf In PDF document text
    • http://wangguanhardware.com/userfiles/file/30508463009.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/pisivivavutufar.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16136d8f24591f---tafiwobesajav.pdfIn PDF document text
    • http://abwrva.com/uploads/files/88886570832.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/vagufuropodigatawax.pdfIn PDF document text
    • http://coachhouse.info/assets/file/62404730192.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/72141171069.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/zugigipipagopogob.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/57192016228.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/smfiavi5na442gi7ifj5qbv0ut/xutolepeniripifetavuzuma.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79e148c11---sopezo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f53865a6---menogedukalitapomux.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/88359222170.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/tusibubekig.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137831f4acb3---31012762943.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d30e4360e9---83206803091.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/gunagujap.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/zulaj.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tajag.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/14668679696.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b1a9fb68---xipoxafinutorakaker.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/97877535454.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210902_43437C01D84C309B.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/96485233599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=anatomy+and+physiology+free+pdfPDF link annotation
    • 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_off0000cfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 11040 bytes
SHA-256: 22e2c2cd0fcc0f862757e3e6e738eda535cb7b285b5a93e802cee3e904050b39
font_02_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 16336 bytes
SHA-256: 710940507358011a9a8f04953b0c83f6ffe79e6494baf49ea610db715a9622e2

Open this report in the interactive analyzer, or submit your own file for analysis.