Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f77ee029339d9a2…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 18:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 968407f4eadd3d4a16d81f7c667ac797 SHA-1: 088d94dcc73776a48c8e5a20faba5068d0351bea SHA-256: 5f77ee029339d9a22bc49ec69e3bb28a025dff75a9d165f6e42df96797f59054
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 0.9963

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 http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/30798732011.pdf In PDF document text
    • http://spy-military-labs.com/userfiles/file/nokujew.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/zurijositof.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/mapegobiwimadeje.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/51844331752.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/tedegakesevidasimedirejes.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/48facisf41l01vedfbcrpha7ks/43877423509.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/31419887581.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050305483016.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7f25c9d6---20920928488.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/770167b0db43d0d617d8a5cbf199d621/wuxogesulujej.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210530101320.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/lofupotezutakofobaje.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6a861e799f8073686b62dcba42b96a7e/68009143920.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/kuxetawexuta.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/1735729054.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/mojek.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/492362de39e729172f45abb7950dceeb/16240427686.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/26224984242.pdfIn PDF document text
    • https://ksboutlet.com/file/files/38718464858.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/429a2ee45eeabf25d130cc33923944df/6614341142.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/li74kbtn9sc1372r7oc92vcb83/vuvoxekidalizilesobisax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kenmore+elite+washer+parts+manualPDF 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_off0000ca7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 10692 bytes
SHA-256: aa0c35f9697473f4f7c4f7026b15981cae6d38386d4c5609af79b1101acb44c0
font_01_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 18400 bytes
SHA-256: de3c0344264e1091e8f68456bf182ff98ca5b7221cd85fd8447e1a217aefb842
font_02_sfnt_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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