Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d71a28eb7587aa…

MALICIOUS

PDF

69.3 KB Created: 2021-09-21 02:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0adda0e7a8688e468dbe132a52cc5554 SHA-1: d788a8c761d023b1141e5ba96d1dba706ad6c706 SHA-256: 78d71a28eb7587aa34927b2efd1ff50c9afd71702eaec3722915d0985cda718f
124 Risk Score

Malware Insights

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

The file is identified as a PDF containing a link farm, with multiple heuristics indicating its purpose is to redirect users to external sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The presence of numerous URLs, many hosted on potentially compromised or disposable domains, suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

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://gdaniec.com/upload/files/fodirumepofo.pdf In PDF document text
    • https://soudurelauziere.ca/upload/editor/file/64198230847.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/17638535555.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/kiverumivanesuvugov.pdfIn PDF document text
    • http://waypl.pl/upload/File/fusozividifevujekibema.pdfIn PDF document text
    • https://guijek.com/userfiles/file/joxizovodopi.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/xufelukojosetasosi.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/fitowimu.pdfIn PDF document text
    • http://ubest.ru/images/file/diwutibopakisozexatewivov.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/51074443087.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16149071fc31bd---29188473945.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161326e1cf08d1---45873497702.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/79c7bee699580afcd552c174fe9e5daa/xovisitolepefulubetogitoj.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/97023631341.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/33404132461.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/konemesurovidabexejizum.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/xalitap.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/gidosejonuvupiwo.pdfIn PDF document text
    • http://premo.at/userfiles/file/93276605498.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1a67d9fb---metevelogazux.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021092016321745228.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/50845722192.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138800741151---vezosajanaxamuz.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613057c030653---17203324158.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/2780549222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=convert+video+into+audio+online+freePDF link annotation
    • 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_off0000c212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC212 18900 bytes
SHA-256: 286357e0c7f18b90af2bedbe2dd3a53ad1905d673d8afe928094a6c8b179918a
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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