Malicious PDF — malware analysis report

Static analysis result for SHA-256 2146fc395532c48e…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 18:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c21584412b134f017256d674cd801809 SHA-1: b575d8bee75cb5938c8a0e574752d7d097e59320 SHA-256: 2146fc395532c48eb26ecd107dcac774a052a1fa137e4e7729168128152981dd
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 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tuclubcr.com/campannas/file/33473491885.pdf In PDF document text
    • http://gesgo.de/userfiles/file/31393524750.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/40097011039.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/ralivijokom.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc80b66eef5---kuzijalenak.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/vegir.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/91597080825.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/aruthnm9opvb39sgq8vp0o5ej9/99632608728.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/91138059180.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/ketixedofuzud.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eee22ea54---ludusexedexifedet.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/wetofuvebowo.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/sulejibezovarodoji.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/27315430802.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dcffmuui5ddlgki4jbnih38tob/xeluraxuviwe.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070913434173499.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/mabogijitizol.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087165b91885---rixokaxuvenidanik.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210612004650_xno6bi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608651454ced6---podivuwazaxikikekamule.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/21246233794.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/depudodezesejudijirurivi.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/tebaruvabutu.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/20882074826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=phases+eclipses+and+tides+worksheetPDF 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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 10792 bytes
SHA-256: 5942dc88ae495e7b19cb53ee96d4d8ca4314a02537fd634ba19cf049e342853e
font_01_sfnt_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 15744 bytes
SHA-256: f298df4cd97bc4c8f06b9fc187f2cf71a949e2bfe3b732eac86dd19a3695fb41
font_02_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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