Malicious PDF — malware analysis report

Static analysis result for SHA-256 d222c0ebc0e26528…

MALICIOUS

PDF

70.7 KB Created: 2021-08-01 03:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 67c885a90f8fe979e6b9624ab5dad7f8 SHA-1: 7c47336750f42669ae4a48e37b703238c8ffbc6b SHA-256: d222c0ebc0e2652888ab93bfe1ec1856aa0af128c6410b0df4e7b0e71cf53b4f
162 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7423

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd80c76c351---50261493036.pdf In PDF document text
    • https://majubesar.info/contents//files/banapil.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d4989335---vategenebomop.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/pobofixavasorir.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/vobosomafe.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6280d4dc44---xadugesefetoxipepafuroxa.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a21fc859e---tipujewitubu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/10rqg06n5pqhi59n1rmdsdav6u/3132821096.pdfIn PDF document text
    • https://udruga-invalida.hr/files/vibozedorofigesufebamaju.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07364bd4d---bajelemagofope.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/l99o29kvh49siu2966gvo2igf1/39499723668.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b755b8186fb---51154385895.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5e263fef2---8325642512.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b5d4658c0---xunulejudorogoxuf.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/64075763081.pdfIn PDF document text
    • http://zxsolar.com/d/files/72958504209.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/00cc22c1c24b9c920a4264db5c77ae2d/49201444682.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608852277842a---zesetovenuvow.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/wawatexemivufa.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/28473328488.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/njg8p142psa7c5jgk78b84ck0e/47794274486.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/fd8ed48c3ae21bc61cd2494fede1dc5a/pagemad.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087233fa811f---jotabewutono.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t4g4qjdj2pt457ecnhr00gc71i/womajixu.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/51482306881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+much+is+fnaf+ultimate+custom+nightPDF 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_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 16776 bytes
SHA-256: 9dc02617146df03303fbefdf60558169be3ada2e8d3b9935a93d9438639897e6
font_01_sfnt_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 10860 bytes
SHA-256: 83a99e0a5829a47ddeceb0c227a4e163d4b3545ac60f468b7e54d5f395846715

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