Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4644f11274e27b…

MALICIOUS

PDF

119.1 KB Created: 2021-09-05 10:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd1c491c58adec59440a9aceb1ca24c9 SHA-1: 1a3f19a7f4514ebc4fb7e428f48586234e2a73d3 SHA-256: cd4644f11274e27b22a12eac39d07224ddbabef63c32b29676e9d54d0ee21efb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress sites using form builder plugins, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=traumatologia+libros+pdf+gratis PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607167ed53fe8---64286818523.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a613733b---rewojine.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4iad3chvtjkhu5ed82vhh6ribt/96058609481.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vajibitenumamalukone.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6c165223fc6da04adccde5e404ee2367/jimafodom.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237c8eaa69f---kifewebawomi.pdfIn PDF document text
    • http://snsi.jp/image/news_file/95778806251.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb74910ba40---ponilojogaju.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/4797419178.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/42115127529.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/72b7e4ad69c829f344a524cf0de94e09/tinajozinunida.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/88629730353.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210705104654.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16109a2fb947c6---10834176939.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/30308306065.pdfIn PDF document text
    • https://lessonskg.com/userfiles/file/50135979430.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7d281cde---xadalaxuniniwakasimi.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/56274728582.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/xijobapepavaparowapeva.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607021f0268aa---bosopemapipuzumekokowusit.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5302dfad008896e5afaf9271faf6f808/nubetewemuje.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1a88a49fd984ecf10bdd52e802244517/62739237923.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/51995236075.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_off00016cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000184c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184C4 18972 bytes
SHA-256: 63295bec7d0eb5ba41de1466bee0d161e030f8a1580fb488911f7c49beecb97d
font_02_sfnt_off0001b602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B602 10808 bytes
SHA-256: 57586e73e1c5419aa6af585934a377015f5fd00d0880d4430f5483cfb1f1c9bc

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