Malicious PDF — malware analysis report

Static analysis result for SHA-256 165d30b84168544b…

MALICIOUS

PDF

88.6 KB Created: 2021-07-28 02:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41c0c4e735c51b13a9324dbb6e4d3ad7 SHA-1: bba6b0c27bc6967f4562f3054e323a9f0fb5c2c5 SHA-256: 165d30b84168544b9d1fea451a4b05683cfa7ea7507e44bca62e65ffe01ec707
196 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 designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ebce5a974be844ac2b21a7129c2009c1/litudivakopoxus.pdf In PDF document text
    • http://eatatrudy.com/uploads/files/fenofiletexu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008dc4e42c9---45149061272.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/fotije.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/kovogusiluladekuji.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5cdc9e8f---38164726427.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/d54s9rpvd7bnmc23ae3avsamv4/fisem.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/8440253610.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b2661ffff---vemasizakalef.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e3bce56e---19157779741.pdfIn PDF document text
    • http://cocoal.com/uploads/file/81186614432.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/77980884311.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/55559631429.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/47466893486.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/71563121189.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa8282089---27074193061.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/kuraxozazejef.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c6abd0334---68029882280.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/98218493136.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072942b4cdbe---dezexixajezujo.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/soniwedudedixe.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/aae410c847c1784cb52509ec2e543091/jexukomegejilujapas.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nuzodadekamemozub.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/28147297917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mini+militia+hacked+malayalam+game+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 10836 bytes
SHA-256: e0c863d92f9e20f36b6185f6b99c7ec95882cdebf06868766b7f18985c76f9fe
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 17856 bytes
SHA-256: 4e72c809fbbf32300183d788f08a6e1848da3f08ab27b755fad80eea2fa4c635
font_03_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 16908 bytes
SHA-256: a142aeac2ed030902b510c47c01139da8475e3eae80986a33d198781960cce40

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