Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b90c245a618ad9…

MALICIOUS

PDF

89.6 KB Created: 2021-08-02 00:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ea58261c492444c57442a451cc09d593 SHA-1: ee0d3a2dea128e0711a571a03bbfe86b32553f77 SHA-256: 08b90c245a618ad90199a7638e1f407064fcb7472eda06a40a4e79ac81d93355
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://swift-tw.com/lcc/upload/files/natizebatukixanajeti.pdf In PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8b12ad8a---xeturozurorulik.pdfIn PDF document text
    • https://autoparkalbanese.it/file/86126727477.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/kaxikijiwudewuri.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54899690738.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088503cd8435---85207497635.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/83134514014.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3b15ffe4730d962d6d98852a7a6e2248/ramij.pdfIn PDF document text
    • http://ashioke.com/images/library/File/vujemuriwepefukow.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/segutumeda.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/jupilolevaxonatimoxe.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9e4654e4---61214498659.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d642169dcb---rexumew.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xubaju.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a98346ba4---42519870387.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ac7002734---vodusuni.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/besarovemokisumek.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0a78937767cc15a6eb5c209655b40e3c/farinejefawudaninonegoba.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/potibabebodefebul.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1e41ce3da8cee3f4def610978ac818c8/93847852371.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/joranemuxulazukeme.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da218597a3---najibimidefamisiwub.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/66648972008.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/zenizexujir.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/q2sudlvbmm8t8j3jf0b5sb1ois/lokef.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/28466509951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+noise+cancelling+earbuds+2019+australiaPDF 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_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 11300 bytes
SHA-256: 184896ab3e624049274a3e4dd80f9655a2dd6b49b97b837d7ea8f3f570b8cb5b
font_01_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 17696 bytes
SHA-256: 591012e10116031fe68dac7048f6d496a2cc84eed291f2c955c7862d54ea5dc9