Malicious PDF — malware analysis report

Static analysis result for SHA-256 650078c347c9b525…

MALICIOUS

PDF

94.0 KB Created: 2021-08-14 00:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9d313ef103cf844782de30dbf38b49d8 SHA-1: 9462eefde25bceab31e26630e866ed4cebfac45c SHA-256: 650078c347c9b525dcc0cc53fbdee5717457dcf8f7c6ad6a20d2a3a7be48e73d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to malicious sites. Several heuristics indicate the presence of link farms pointing to compromised WordPress sites, suggesting an attempt to distribute phishing or malware. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/8p86lmuc1d86ocouknppe50g09/18663301194.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b94cc2cd5---4907072216.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/81170173253.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/31480061412.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32c8abf56---negujixabunajazukol.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/fdd3243b0f5880e11f0375b3b82af252/83959294516.pdfIn PDF document text
    • http://htcable.cn/d/files/dimukiwolifizefupatekedux.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8c6deb97f3e5fc27d3ed9ad2d8be0b2b/ganopopalirepimotab.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a75ddaf4c7---fijaxevuzafiwuri.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/53141588092.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bfcb1f30550850797e587f8a4a137a26/sadegegudadukutisoxiji.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2787e4efa3403dbb29db93ad86c9903a/gelalajizatasenixojedijup.pdfIn PDF document text
    • http://jfe.hk/userfiles/41141781837.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608323af291fc---29037912845.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/09cca736b210875cebba0390cbcff4d5/zibidexevibijaporemeweve.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0b934d1f823fd6d02c5f3f045e896d57/95034679251.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ed59c62e6---bopegavagotizubev.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/52bd7a3b4a7ef852054bd1ec877f68db/defoki.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/kolowiwelo.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/zifirame.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vebubofigowedorage.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7534ef9c---dokilekulovado.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/temak.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/nenewuzagelitamaf.pdfIn PDF document text
    • https://slide-bearing.com/d/files/72451646327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=exercice+sens+propre+sens+figur%C3%A9+ce1PDF 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
    • https://vimeo.com/507732711In 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_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 19892 bytes
SHA-256: cebb460f1d1fdc53d0c5a277cc827bcda7eb987c2bc000755b953c88ca093195
font_01_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E00 10740 bytes
SHA-256: 6bfa46646ae5ddb1be5f164dab30ba8228e8146cfb333410ffb5f07e9029e7a4

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