Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab8fff92d77927f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 01:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a8a49ecabb3925b0b9b285560d6b9ff SHA-1: 36a8b66beb74a5c31ef6c972a73178f33c07adaa SHA-256: cab8fff92d77927f7a0198d54b6ac875bd1a544a8990d3053e1b36c8bea15afb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to disposable hosting, indicative of a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, likely to bypass security scanning. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://anandamsanyal.com/userfiles/file/95670231494.pdf In PDF document text
    • https://kaowei.tw/image/files/20210909_125423.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/poreta.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/74762725500.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/48131fa1223fd02c88f7642fba405a11/18293245720.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/28214110191.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/1828211149.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/mulutegazereguzojezadu.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/fabapilesorilunuxogubab.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/702ee311a82f893f3cb4412ce3c9747e/33663774493.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/62143433921.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/35459977267.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/tosopif.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tear13dvmnvgtqcs2urvt2iod5/kigijalerafeg.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa6241b66---71107266036.pdfIn PDF document text
    • https://parc-hotel.info/file/jazinozemig.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/54396543804.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/93589612343.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/90537636661.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/rakanubejevomat.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/borisefeba.pdfIn PDF document text
    • http://computerdoki.hu/user/file/zisezixolurut.pdfIn PDF document text
    • https://istanajp2.com/contents/files/mirisusosugolawuwi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4a0144c9---bugusuvixugatifep.pdfIn PDF document text
    • http://abworder.com/uploads/files/sijudepaxofola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=basketball+live+stream+freePDF 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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 10500 bytes
SHA-256: f57a6210950f91ad22e022b3ca70cf2a864a2848baaf0050e29ceefb503fdd17
font_01_sfnt_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 17856 bytes
SHA-256: 33b609d445a90cf7d1e8e9306fd7c1bf7245a529a486d774eb07b3eeca56236a

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