Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c63ba118a3947b…

MALICIOUS

PDF

82.5 KB Created: 2021-07-21 13:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: be227ebf7134ef28e5198af0ef8a9776 SHA-1: 5fc80fe126051c5b2410c08912d27c86b366728c SHA-256: 87c63ba118a3947b9410beaa529450c25d54a36dcc5b2dd003e5b1848981273a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the link farm suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dycmc.com/DATA/upload/files/202106121312214969.pdf In PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/pefotigigipojo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cced6d0f1d---68659548613.pdfIn PDF document text
    • https://t2sc.me/userfiles/62118958562.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/67e93sfek8ud99n72crjdop1ll/jokuluze.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9lkv4och8cv8fgj3fm46otmnof/fefiw.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/manidifopumimulom.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xatidekosokux.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/negisosuf.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/68c11f1b238829c1d0fc9ff77347e694/kukizigum.pdfIn PDF document text
    • https://zold-kommando.hu/files/9201412719.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/69217a4dd6356e49225bc5f4890997a3/31815765228.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/12355948230.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/30450352342.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3add3279e---6973642532.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/13562792439.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/62289361204.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/476600a659e17b5862e016bafb2324cb/jipigitopowegarerafi.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fa668943---18531394851.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160caa2cb347c5---26242431007.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071971c57b06---5832765945.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/sibagukimobatebufosadiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=blood+circulation+through+arteries+is+which+flowPDF 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_off0000dfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 16724 bytes
SHA-256: 34c32b15378435b85fb98e9a7640d12c046ae59e666af6379e354418a83e42b7
font_02_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 10992 bytes
SHA-256: 43306695ca17d30fe19d0ceed70be1846d7046b71f7e0f436e5229803d6b01e2