Malicious PDF — malware analysis report

Static analysis result for SHA-256 1671ab0857a26141…

MALICIOUS

PDF

86.0 KB Created: 2021-09-14 05:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b768a20837599701baefac0548e5b6b SHA-1: da6c3b46ecc5fe22fb5e4f3b1e1c0dcc64ab8350 SHA-256: 1671ab0857a261414a4ade3d33d95e1c2fc28a384288be668f4962db9298ce42
154 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5214

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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a621b5f30fbc49543d215500d1289aa/41860510835.pdf In PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/30649543455.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/42rr3dq1194fnsrdlugevcf7vg/20797722714.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1239494d8---wuzefa.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b8a112bb---11240816776.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/30970422527.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109110201414406.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/muritegifem.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/71754561155.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/7078691875.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fmed5uesngr6pdfv1h82531rrc/86964745842.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wigoziturenagibulonudegin.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/ligexexagasedozig.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4d34a9e4---sapaxaxaxukogexejab.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/buperitodexetit.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/rixarimifopulin.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/megipixubepofizus.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a16e492d8d---paxakoraverojilagonelap.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/74758287164.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/897f56fecdd1ed648cf85460981eb588/gadelatunakunoxozes.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/58366696065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=to+the+forest+of+firefly+lights+full+movie+english+dubPDF link annotation
    • 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_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 11024 bytes
SHA-256: bd54313441c33f8f16aeece93a41397683fb2132a5d9cdfbd2b8c02cbae5e0ac
font_01_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 21428 bytes
SHA-256: 420dcc22160577451e91a6b67a5a3c4e76945f4ab2716175b35ad76f06960e12
font_02_sfnt_off0001413d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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