Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64f95eb99993cdf…

MALICIOUS

PDF

80.6 KB Created: 2021-06-28 23:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d5a11e8f7dffeb3541e0b77a80282ce SHA-1: c59854e935afc476e7b604c73dc462d2571553e5 SHA-256: e64f95eb99993cdfc577496e301bbad32f3ddffbf59472d0f092d06e40fc753d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials. The presence of multiple PDF link farm heuristics reinforces this assessment.

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 http://jp-photo.cz/soubory/files/kupatogefifefuwopoxuxi.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607272cea41f6---tofami.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c32db73cbb6---jelavixufosogitazaj.pdf
    • http://evohome.pl/userfiles/file/xenotekumamemumebotosuso.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072c01d8dd9f---miwetotu.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160865990eec32---telogekinonuzimizixalozas.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ca6a90a63f442b53b9d0fe4eb74b836b/73577532495.pdf
    • http://fields-on-earth.com/tivotubudumebiwidufazimaz.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/67496797711.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/lamajogogena.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ec72dfa955f322d681ea45f4fba85c25/85050680382.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d76d6683917---60889083954.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/dd477b71244683cb0403f74e1c682912/8949845484.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/h93hpo9koidi4urfna0jv0g681/jupuverupuxaz.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45bdbe37dd---87834553472.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9ae9549b4---92567257525.pdf
    • http://www.aadhar-interior.com/userfiles/file/41822243930.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b04e2b4a---nafedetumamizoxorata.pdf
    • http://project-st.ru/userfiles/file/96464068298.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01568efaf---jisakageporevosisaraje.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/320d228e16c608c6d7d8ece042210a5d/sulosaboxavusom.pdf
    • http://keralabiblesociety.com/fck_uploads/file/79641569969.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/66c758934fc31dcef24ef92c822be6d8/negexidutodetebodeli.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=once+seeds+have+germinated
    • 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_off0000d876.bin
7deb9f726221058a5dc64296f540fe3c5e273ee40644d8f3135666af60bb0a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 16912 bytes
font_01_sfnt_off00010499.bin
e6f221e8c216a95e71a195c2b3e02839dae4d5a95a674583b8843bacf4f966e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 10744 bytes
font_02_sfnt_off00011d06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 16792 bytes

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