Malicious PDF — malware analysis report

Static analysis result for SHA-256 07911e6653521a03…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 21:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cd617fd6bbb2d65ce983171a76c2ea19 SHA-1: 92c85daa1966a5d5a86fe159ae69b95f3a5eba12 SHA-256: 07911e6653521a03a925b9d62219fe456f3c9d4a3ebc65b176af5ffdadbe9051
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6537

Heuristics 7

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/aejroo1edvgv6f4ldohveeuhvb/juxuxap.pdf In PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/sulovozu.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/10584442943.pdfIn PDF document text
    • http://gugugroup.com/userfiles/difopodififabikoxenajisul.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/tufejonoluvem.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/fupilovigilifanerabebud.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/rivokopezake.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8ebd6f7f---91806165729.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/sasifadametuzivam.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a723514c---16026066253.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/pivivifuriwunanejum.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/fuvopubemuxadesegomud.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/vorusafefereke.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630550276.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/88239283849.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/lobef.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210906113037751666823.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/62055614492.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/12064453092.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/renexepewozoderozetabiko.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/64956364294.pdfIn PDF document text
    • http://potlista.com/file/files/87671766304.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/gunilel.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/wufukilefonigek.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/tabixonufu.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/bejorozozixebakumulalipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=exercises+will+and+going+to+pdfPDF 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_off0000bfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC3 16368 bytes
SHA-256: 8019ea5cd07419f1c7e197763c1f7f2020f1c5fc171a43a3eeaaa55b046dcfa9
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 10964 bytes
SHA-256: 7e7ab49a95e79e40f935952946d7f84d7d641382ff684803b1b8ba35c4880f67
font_02_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1