Malicious PDF — malware analysis report

Static analysis result for SHA-256 2683dc76799f2ef5…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 15:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3fce3823975ea9e39c4910f53510b87e SHA-1: e0b19fbbc37cf901beba39c0819f1f29e8411d31 SHA-256: 2683dc76799f2ef599bf4b7af783bc2bca5d374481ba326312183ca5cc7ea451
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 0.9981

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://medvor.ru/uplcv?utm_term=triangles+class+10+all+theorems+pdf PDF link annotation
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/govazasazunede.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9bbhpd60b9g0ldrc1hq5844oa5/58111875742.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/51283767336.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/50115355132.pdfIn PDF document text
    • http://unsersohn.ch/images/file/68271904324.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/77462550531.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982dc810f91---wexirage.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/wolasimezokof.pdfIn PDF document text
    • https://aashianarealty.com/file/25108440428.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/warumolad.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111feeb6fd2c---fosora.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/00ce0bce789ae905fdfdb58a80feb1c3/9710752667.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/9239342348.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/75398470597.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kpqcpnmk3rbqru4o5jjfa7dsjh/mirataz.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbe87085c6---13788857048.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612dcd2ed094b---12252530070.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c8a6ebf10be942dc627a4e4e92d05722/xerodajolaxodonixesek.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3387e9c2b8---kuxig.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/goworobujuzafinorasani.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/82280295814.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/93803846804.pdfIn PDF document text
    • 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_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 18796 bytes
SHA-256: bd21950de089694474ab4a120fe013eb66a5ad37a0e4f607d2d4647e8070b945
font_01_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 11204 bytes
SHA-256: f5127493a34bfda0d246064f6aa6e5a63ce09a7c78b1055fe9354a1dd0d21c28
font_02_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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