Malicious PDF — malware analysis report

Static analysis result for SHA-256 49af6343ddf19ab9…

MALICIOUS

PDF

73.1 KB Created: 2021-09-02 15:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: abfff9b4ad39d733030e5579304dcdb9 SHA-1: fa405c414a03b3256e9dd90c0a39d2c53bcc14ec SHA-256: 49af6343ddf19ab9f83ec0c8fa322d16f2521a1c56768ae9bd0416a177f83026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to untrusted sites.

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://wastran.ru/uplcv?utm_term=punctuation+symbols+pdf PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6a6415a92de69960c2a6b489a7fd8076/30316233737.pdfIn PDF document text
    • https://stvorki.ru/files/file/92105660794.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7m7qbms71vilg9po2i7am2sdga/90213771567.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/kugavudodus.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0f8ffc0e60df90281eb5685e9b5e433b/xikuluwuremavobuditali.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/wunifurakod.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/nometibefin.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/03f61b58369c6fb617a23da410207715/xilifofeturafi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/tp716iti8i5t1basonlkttmbju/sigorebadasib.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/riiptjm3dnnqd6r5o39bfa7l2d/pefederolirukuwedub.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/topoximaxekefazofapix.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/jaxuzik.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/53356998557.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/45f0e024c2f6b0ecf730b191bd327147/buwikedefupiridadudo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bcf184caef456fd5428e3f3948028f2c/49483371054.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0340dbe5---belolotusobowu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3e4a9b5a277c7c5562ff83551c82be4c/11426572258.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/vaxijarekotuf.pdfIn PDF document text
    • https://htchninc.com/d/files/81715125720.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/vubegon.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/0b38c09eea76c36bf61890ffb649b450/figizepoxutamumew.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759f49ed68---wamivotudekofodezeji.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_off0000b74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74E 10904 bytes
SHA-256: 6d358d44cfe33419364758f141163000af6fec8634c4fd97fefc1c024a600003
font_01_sfnt_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 18420 bytes
SHA-256: 4fb3798fd04a8ea95fdb60c4bf23528d83b2d5e09af195164899946101499a41
font_02_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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