Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6a8489d429faf8…

MALICIOUS

PDF

98.0 KB Created: 2021-06-27 12:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 421a02445f7d406c3a78330c06e6c73e SHA-1: 742c4cacac775a5e861c385c91c25792bad69a2c SHA-256: 9a6a8489d429faf810778003acec361c942f959b54df2c15e215c3e1f0310e90
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the numerous external links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074675c2052c---legofisokiparofefoxib.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a646dd2f382---81013175124.pdf
    • http://keramann.ru/uploads/files/pududifiwexidigujedoxodep.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1d540f9c40e422a9e0ef3421298fd107/puviloxujexonifibudiravi.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed2dcd7bd7---sireliwo.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dd18va37ceur99k17s8mg1mqh1/86536168407.pdf
    • https://vildmarksjagt.dk/userfiles/file/26980668236.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160904a424f5cd---jekakijodokawalitebu.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761bbc0d742---budafisu.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vmh291juph4i55md28nr2he0ml/wofabip.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/ranuzajusutimixukazinuja.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a921ffee---zawonodekudupudimo.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cc879bbe8841353819e66f53c5e29046/wijupujanukaj.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98b0a8700---48027528794.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/d5itpafmaiitptfhed0co909k8/gijituxiduvejor.pdf
    • http://canhtoanland.com/upload/files/setupiwoserup.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ccd62017a9b286e5f65f9b7e17c9cf6b/36357002303.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160925846a7c0a---86675830656.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47023c1624---58509533270.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a9e677bfaef4b223ec54afaf96da8db1/tiwipobodonitepukomitozom.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/07cd67cb65d3a9e961bd698578e767ca/rutakurudosexorupu.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/i6flk93pueh602be2bhni7i4e0/58045531616.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=good+vocabulary+words+for+6th+graders
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 16792 bytes
font_01_sfnt_off00011bef.bin
a2794e832b191cab2e9f44eeb57154fbcca8cc038880a6b8014900bfc05a8c94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEF 16144 bytes
font_02_sfnt_off0001313e.bin
c6d1994f66cc0ef0c181a4e0e9429236a595aa3473b63b3592857aaf60f383eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1313E 17820 bytes
font_03_sfnt_off00015fc6.bin
57652fdb91850c19f5c67d531df7e5cd08ff9a58cc0f636ead38d14521344350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC6 11272 bytes

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