Malicious PDF — malware analysis report

Static analysis result for SHA-256 42dbd8682d419b6b…

MALICIOUS

PDF

108.2 KB Created: 2021-08-23 11:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bbce7c159968a16648fc0e83a8316a69 SHA-1: 2bdbf3a9db29fcb4246502c7311779e3e743e12c SHA-256: 42dbd8682d419b6bcf8111effa85d187fb968428fc6abf2fb6a5e11e65442f89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7451

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://synerhu.ru/uplcv?utm_term=manual+trans+wont+go+into+gear PDF link annotation
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed351be88c---guzirikivixube.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0bcast07d1gnccuiq2evg5b37/13438757570.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/20743691616.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/58038190242.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/1593687952.pdfIn PDF document text
    • http://ruihuitax.com/files/file/28627770491.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6fa29185---21251910354.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/cr7g9p4qec2s55g3pdghbksj8h/bigidi.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/828150512.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/fenomagubafe.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/37556395244.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/8e75ded1ec0107e433f9c3e8dfabd064/dipifil.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/13041100243.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/laxexudozujupiruk.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/noeg8a6qcdjf10okn94krn3d55/fegupa.pdfIn PDF document text
    • http://iltorg.ru/upload/file/80968687788.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/84807806523.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/buwolimeborukitekovug.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210716000253120.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/20d811fda07b1bcafb59e0dc83ad6bde/fawexe.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/tiridiredavalaxos.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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