Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb972cd71a9f753…

MALICIOUS

PDF

61.8 KB Created: 2021-09-19 14:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e8815e0889f079638a471c60f73fee8 SHA-1: 480cd4a02570dea8998e00951d71dd48b059c6f3 SHA-256: 6bb972cd71a9f7531a49372dfa75580ea1c8d69634f50eb625f7febc02763c81
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4315

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 http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161349703eb594---xepapusokonam.pdf In PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/81dvkemn3uuto2phkss4v9ce4k/jewaxenoruzenupufanin.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wokopisifafamutujunat.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/tesip.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134402906cd8---71986194628.pdfIn PDF document text
    • http://rentaruedas.com/files/others/57684209420.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/27764127414.pdfIn PDF document text
    • http://citra.cl/userfiles/file/zudarixozal.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1bd6c32b---zisubugaziganasamere.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/48346074255.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/zadukopi.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/pufisonalupa.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161348cbcde3d6---wisabuw.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450c18d010a---mumesigit.pdfIn PDF document text
    • https://majubesar.net/contents/files/wimowezalefubama.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/kokebodevovefafeza.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c2a1749e6---47748060106.pdfIn PDF document text
    • https://toocapen.com/files/33027245405.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/nitudemosekepojowifuxaxer.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/86492960280.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b81a11e63---zotivasajoxa.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/95209024516.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/nafurosetutode.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/91337889092.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/musixajivijimeras.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/refakafaxudupep.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/vufokirulofad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=higgs+domino+rp+apk+versi+baruPDF 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_off0000bb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4E 10980 bytes
SHA-256: 68cce4497fbb910074c3c13f0fd60bbc433df5fef4b1800d11fe78fbef05d99f
font_01_sfnt_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1