Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed2b74065bd93cd…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 03:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8e6339c84d0d6d6921866ca0361ea7be SHA-1: 9dbb8aade465bfa6904898ae6596e47e350d50b0 SHA-256: bed2b74065bd93cd9ce9abdb8c251154c31df79826d110dcdd02708c1fdc56ab
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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download other PDF files from compromised CMS upload directories. These links are designed to appear as legitimate file downloads, likely to trick users into executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/32bc481586c6d8183eadd3f3e9e869f4/rowafepi.pdf In PDF document text
    • http://homeloanz.net/images/e/file/31092065348.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/nixizukedufasinotili.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead91f3d4d---watijizini.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/resuvonaziso.pdfIn PDF document text
    • http://retailcop.ca/files/geteg.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/punuwe.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/84725246692.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161487587b362c---lupovajapivesukokigofax.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/gamezabirakosu.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/82865132912.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/51256586673.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf0110cdbc---rexewativupoxamawuririga.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/pupegajad.pdfIn PDF document text
    • http://104408017.linker.tw/files/79217241593.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210923_003812.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/82047f7487d31dc0cd446fabfd60eadb/kupetutujudegunugubasarij.pdfIn PDF document text
    • http://gugugroup.com/userfiles/39425483419.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/91283603388.pdfIn PDF document text
    • https://petribax.com/userfiles/file/33309037942.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/66408733958.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/50961965961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=carrom+pool+mod+apk+2020PDF 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_off0000b426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB426 10324 bytes
SHA-256: 37c89e5cb26a910c7ff268d3dfa55849a9c8b70febda7ad11ef8ca739261e81b
font_01_sfnt_off0000cb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 19424 bytes
SHA-256: d4d9c39e7f1dbad4c8e8d02f80e18d91d4bf3861d4941b60a1da5c5bf5bc84cb