Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef1ed0906e4631a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 09:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40f21712ddf86729789e7b427f021617 SHA-1: 4c15d9de67f2d2a6a770e148e4119e45f0993b47 SHA-256: 8ef1ed0906e4631a668ff4b23954cdd60868e40743211b4d8857199673608011
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded JavaScript points to T1059.007, and the nature of the document as a potential lure suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hanilkwanla.com/uploads/files/sumegilemizatajam.pdf In PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/berugeli.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/8390385873.pdfIn PDF document text
    • https://lazerom.pro/media/file/zijefemesororo.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/49265357802.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/aadur861rcuunqt9uejp3gnejo/tamaxofa.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/geguvisakuwemiruza.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/pixozanuguwefasopun.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/d38e0a342ed1e9e2cba44b3144ccffd0/pilagawipogusizapilimage.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16125658302a77---56297157466.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/31642472715.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096f882574bc---sedatoloma.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/579269909.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4e1b3e2aed4cc794c2d1fca67518b2b3/83269113404.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/76587858127.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7c1b85587---42747657740.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/lezegesokuvinanog.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777f613dc6a---gufafififovevametobodu.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/devadowogitego.pdfIn PDF document text
    • https://activepymes.com/pub/file/571630020.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/77135314961.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/wakug.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a89e04f3c---simozom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=profit+and+loss+formula+in+maths+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_off0000cb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 10732 bytes
SHA-256: a43688323acf161c9628f9a57093994cb2a3c3a5e7d997a45301b4fcd3fc6aeb
font_02_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 18640 bytes
SHA-256: ef1e0e7b02d8fcda4f5238838fc67adab44899a4517d13e94c860fedee37fc8e

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