Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a91961f7e0beaea…

MALICIOUS

PDF

94.9 KB Created: 2021-07-08 17:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba9da075a48f71165d7c63a86cfe2b13 SHA-1: 12109734233add3dc4f22a55f0e5917766c09c71 SHA-256: 4a91961f7e0beaeaac419db558cd3d1f78599ea9a6a8aa2c8111312577a59ab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=russia+in+space+anatoly+zak+pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/7eedb57da833c8f9be1320cb1e2fdd0d/82854355656.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8c7f4727187f756d50697855c71eaa7e/vutukiwa.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9bbce0dd---76008008376.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/981e3562c59fe65793cdf84761db680a/81106476294.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0390374031---xudupotonasezagubitezoja.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/cdcfm0na1kv322v4s36k5m4hu5/49916956223.pdf
    • https://seerupit.dk/assens/file/konijapolodenabibizum.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5a64b34be---29661796842.pdf
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/68069280079.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9e5f6fad37aa4662d4eb2372bf79fef8/92474374784.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b590f44e296---sugetejuwelijuxe.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b6disgpghckdb4dfhab24ld2b1/99550651012.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7cfc92952c56bf5bec2ddd1ec765bef0/mawotizokenidivuti.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a9580198cf1437e7cc33e74be5a332bc/43564076661.pdf
    • http://samnakthodrahassob.com/userfiles/file/zadagisexuzilu.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e1dbbb0bd---13700111434.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/74442712912.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073edcb8b17b---danonaju.pdf
    • https://ludifrance.fr/userfiles/file/gusojixixo.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc30391710---bilajuxilejidenebexud.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ee540a1e7---88997258654.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/426f129e2b69fc1e32063e3a4ccb0a3e/liduzufonal.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/67b58a246deec7c442b4b52b3cd4c36c/jelevavetepepipetewopeze.pdf
    • 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_off000108fb.bin
380e84241270624e6a0b87d89ee7a6d31b4cb688831836a172fdefe98bc588bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 10924 bytes
font_01_sfnt_off0001227c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 16792 bytes
font_02_sfnt_off00013a8e.bin
cb64b7bd74bee38ff0ea631cb58470aa1d6a5d91a25ccb01868deff827bfa818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8E 19348 bytes

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