Malicious PDF — malware analysis report

Static analysis result for SHA-256 552cd9033151cf31…

MALICIOUS

PDF

83.1 KB Created: 2021-07-20 10:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90425825fac94787cff9f3390d827d56 SHA-1: d268eaf1938eb5b232986eb2333292638b4fbfc8 SHA-256: 552cd9033151cf31f25d46ba987bfac2e60d27c2360a12aa155580bd9336fb13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised websites. The PDF structure and the presence of multiple links to disposable hosting suggest an attempt to lure users to malicious content, likely for phishing or further malware delivery. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4037

Heuristics 6

  • 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
  • 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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/14pabtaurjpvluln67p6lov5o0/medanumorib.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a9n5l6ohvmlsq2lp1h8eo29n5t/petosuseze.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1da0893b---98248632092.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/85133071549.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/kegujazuvewevaximosabube.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607191fa967d2---xijariji.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a6f58b1c73f05e7318bca3b7e4d42ac5/5792363985.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/xazivojuvufevinoxan.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/tevapejagekoporodife.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2462d96412---81125974379.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/92885022449.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/91882719413.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160881df5da0a4---63792733729.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0e752aff---zakokugotowagami.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/bulugajazipo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb49577410---pebogifomuzinavu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91ef3d5e12---5545984398.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/prjmie6ev13bsc90542be6pmfb/lokarir.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/91194587433.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbbc379738---zemufobagupu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609efedcb6326---78810878638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=challenges+faced+by+youthPDF 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_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 17296 bytes
SHA-256: b1fa94a8735976ec0012de65a4864b161a2e4aa5b6e7da6c4c97877e166504da
font_02_sfnt_off00012fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFF 10948 bytes
SHA-256: 6cbee5fa1766ce5551880fa148d8569487d5570494915aad68c36a281663309c