Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05a7f405892bcae…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 19:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 232032551e88bf57064a6901f87393bc SHA-1: 93511357b82d75484fec4b69d0c0d84047bc55b0 SHA-256: c05a7f405892bcaefcbc4b6b5752d08774018fde9cd1b29d13fbb9b4727b36f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=going+ball+apk PDF link annotation
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/mimimumen.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/dafumu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/66ee45e2c590726c3a0cfa1b408e1c97/furorunamozalupopiva.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/fifoj.pdfIn PDF document text
    • https://digireg.ru/upload/75639033048.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/girizukakalepija.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kuribujotova.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/wevada.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4a49e68d5db6cc11dc415680024e0d51/pupatozoromapajisemuluba.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/lenapuxixemaxajezivuj.pdfIn PDF document text
    • http://ellev.fr/upload/files/silaketagifix.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/85924730032.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/82120570303.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/12736225735.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136628873794---74497370745.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140be176f3dd---sikotiwige.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/belabesazemefemokodirisow.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/lufenabinapet.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/6191555038.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/redojagedojisumapowabelos.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/34365232282.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/98353266738.pdfIn PDF document text
    • https://dhesient.com/media/lapuxozukem.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/fosub.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/30200197071.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_off0000c151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 16340 bytes
SHA-256: 2bf359574ffb233d325e5f533d51638f59b43fc89f501af0dff394afaa80d890
font_02_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 10200 bytes
SHA-256: ac17291b15dd2433697f1f99d2764e71deaeaa94f75d7ead03117c0e9b7c1169

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