Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5bcfe1d55d9fa8…

MALICIOUS

PDF

93.6 KB Created: 2021-08-11 06:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8584ae5348b5ed2b0f96a26d155dcda0 SHA-1: 92040a2a722d35e3f2a24f25153f016590c6bfed SHA-256: 9e5bcfe1d55d9fa8c72f47be01226f12cacaa44b630644aa2376305e2e82e3d7
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting, likely for phishing or malware distribution. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1922a56bf3---giwogakuxisajumifed.pdf In PDF document text
    • http://trips-in.com/ckupload/files/69444289206.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/42831274582.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/nopigariselurugabepusuvi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/04707c3a146e4b3233d030ec6789ac4f/zapawojebovoxavajiza.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160efdfffd69ff---xoguk.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c74d9a8254bba3e8d7425f613228bb89/nokasefasavi.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/89532580915.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/61242026671.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736309ca585---79281163432.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uefqoka1ir5qmskl222ah7euv6/mafonusajog.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160764eda0fe67---14468118714.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e0591f135---19544850827.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/tijikeluguj.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/sekoxavenifikugeno.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/niruxupelujopusewenaka.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/gisidavedina.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/xekibonafatad.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/74727455861.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/pimebem.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ujc2mb9uck08l372mt3pbpqbhi/80340321686.pdfIn PDF document text
    • https://partner-support.net/user_data/userfiles/files/zajawen.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e52eaad0a5---zowelikoxalapat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=history+of+islamic+architecture+in+chinaPDF 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_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 10808 bytes
SHA-256: 2cfa26a8e062bc26130193e3dcb468277c39dde2910aef7d231e766727395318
font_01_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 17536 bytes
SHA-256: bfad9b32b1995d7c2cd771748fb299803f6d5149214b89c78ab8076e50c4bc3b
font_02_sfnt_off00014f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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