Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9b5b83dedd6ff2…

MALICIOUS

PDF

112.0 KB Created: 2021-06-26 06:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f2a19649474a1028f533ac95632712c SHA-1: 35c7311f76b92b69a18822b03b1c26bcb5c83650 SHA-256: 4a9b5b83dedd6ff28130af2740cdd5a6ee41ad6508ec018e61533dadc90dbd49
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://senhewood.com/d/files/76912078956.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/16f881322b550929beb7c286742a467b/wanavofubigabawa.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c789112aaba2fded0d6a60e2a78554a2/vuwoka.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/sg7rjjf95ceque6c9c45f7vin0/pozufenawulujibomusox.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/95729985222.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/21967704941.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/167ee4167b14781fc5bf768851c2e36b/183904693.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe9acb4b4d---wewusepufazimu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/25b8dae31ea224d946fae3aba5858ae7/faloxoxamejer.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/gugunowivofipaxetud.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ci62fa24ei0s1smksj0h65ao85/2070944979.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/24116037491.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f988b06e---32442795840.pdfPDF link annotation
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eefc31a006---punojajogakadem.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94239344d8---torezabupinub.pdfIn PDF document text
    • https://digicpictures.com/downloads/budomikudo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/f1hd02ot10lhri3r2jfqgodui6/wirusu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05117be2df---29042661546.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/50842345446.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886afebc87e---lekumedukuzemonugavuxur.pdfIn PDF document text
    • https://asiabiru.com/contents//files/1610477397.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54279021e---muxorofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ahus+atypical+hemolytic+uremic+syndromePDF 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_off00014f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F99 10972 bytes
SHA-256: 97e75d9eba1f90a5dd410497c09dba70076df5ef032bccf422614b7aa221da89
font_01_sfnt_off000168f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F1 19112 bytes
SHA-256: 7c725db66e56ef9817ae66189bf4a9fd8ba08163bf2e1e3cbf79615dbc2e4c7f
font_02_sfnt_off00019aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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