Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7ee7fa4c76d4dc…

MALICIOUS

PDF

73.3 KB Created: 2021-09-15 14:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c37d68ded8c1d0ba66f8fe0afc409d7 SHA-1: 6de197b57a479b4f4afd71207651f5b4df6443b3 SHA-256: 9c7ee7fa4c76d4dcde6e75d08ea7c39d6a3ce4f155ad6ceddf595d2633dbd180
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links point to compromised content management systems. The ClamAV detection further confirms its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4113

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=avee+player+original+apk+download PDF link annotation
    • http://aquaclub.hu/userfiles/file/54285743896.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/gapetapigevigisogesasi.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/bitopebagijulum.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210913195349.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905092140161597.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/5220836095.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/169f8cdc7c57aae7a17663500dae731e/57993216052.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/tipazuvunagigavajite.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/pijifavorilorawep.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/wetonimem.pdfIn PDF document text
    • https://efnnma.org/files/file/metakepimuzeponakawaxaj.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/rejixupomefodojowum.pdfIn PDF document text
    • http://beta-rc.com/upload/files/98053306920.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/donegewopozofadimejirutu.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/69144311800.pdfIn PDF document text
    • http://vpsystem.com/files/fck/gigovapadas.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/70828045687.pdfIn PDF document text
    • https://eurotig.ro/file/74846798600.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b75eb2b46bb8b151d590a66bc8201fff/vomoker.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/91010058887.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82c26a87d---rarejilarabizibopozotub.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/xogakujeseturabotevi.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/potovevirurovokapuz.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210909124313_s08m52.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 16980 bytes
SHA-256: b946513d4df5de3bd24b82950039b6e132629d5a7d6603bf9f5442937925c517
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 10640 bytes
SHA-256: c5e258714ce3423a93b53b156a28066bc21ba234666c93e27292aaa58cdefeb4

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