Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6c74796f9958c4…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 08:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4afb03d4b402bddd79cd7c8d3fff534a SHA-1: 113ed2202f5e3e2bffcd377354fe878e1333dd5b SHA-256: cc6c74796f9958c40daf0b6d0747b76708643bfa71afd01091a7a0822571c9f0
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, some of which appear to be compromised or disposable hosting. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=ludio+player+new+version PDF link annotation
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/85980955571.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/8180682859.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9846384b1---58179207600.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d267237be0---88776484770.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/sanukukijubumulo.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/47143114638.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/naxidaponi.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/sebipijejusegifobamunex.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/kevipolobuji.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/jusopuzibes.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/vopumabularenoje.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/xoguvubepevak.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613389921f5e2---59726195088.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/10641820272.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/94601267165.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/69872907996.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/21624531381.pdfIn PDF document text
    • https://manenshop.com/upload/files/38238698086.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/komatonexumibawok.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/biwutasomiguzo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135af18ca7c4---nufofof.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161409135b4b00---7875687760.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/dogasukamakazejabe.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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10608 bytes
SHA-256: fccf685137bc4186787d9aeeb81f3a6b05371ae1209fbd4a7839fe4594c8fbe9
font_01_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 19920 bytes
SHA-256: 8166d0dbf7cb87304c036047470b0ea0e43ec7c46510416e69ec415dbedfd0af
font_02_sfnt_off00013b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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