Malicious PDF — malware analysis report

Static analysis result for SHA-256 408cf889011e006f…

MALICIOUS

PDF

84.7 KB Created: 2021-07-05 06:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa6dafc424111cc5d2ff236d6fb2fd8c SHA-1: 27e08657f242f5f121e06fd8dfdbbb1f03c30742 SHA-256: 408cf889011e006fcfb87d566a053161c42039f5cca27c808c530033fec7a58e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://erfaspot.com/resimler/files/67013363425.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607243e9588a0---xolubikesazip.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/sb3i4i8tniuh9vj5vlu91beq87/54457623847.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7fea7c45f63e32300c5e1f1ae7193bda/timunenataxura.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/81450395862.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/lh6su778cr3htcecnfvhkmm546/wituropela.pdf
    • http://stonebreaker.at/76417152880.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dlp5iciq8mh92651h1bojsg2m5/64156018568.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/7gbbnb7ut8ul9g6li9i27mn8dv/rukagokikikoretalaliwu.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1917ba2d31371adc61707733f78587f4/vokilinafupiw.pdf
    • http://stolizstekla.ru/userfiles/file/xerisojitewusepenegesoni.pdf
    • https://phoenixturkey.com/upload/ckfinder/files/19765953246.pdf
    • http://areaarchitetti.com/userfiles/files/29412144764.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160822e8c84b33---51833054667.pdf
    • https://adikkedua.com/contents//files/mukalidunasuwiz.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087c364c9ba2---tezin.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1f55778f---5385462148.pdf
    • https://bobecoingatlan.com/uploads/editor/file/fawirasevivi.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bddb4ec96---wujirabovus.pdf
    • http://manpukulivermore.com/uploads/files/fuputi.pdf
    • https://asiahijau.com/contents//files/zerogatukozewenedode.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16201959287483.pdf
    • https://vildmarksjagt.dk/userfiles/file/21890939783.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc9b803a5---55780864065.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+stages+of+clay
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91e.bin
b3ec0536955611055d6f33fa74379d62058f985f809f375bd62632df8d4a5335
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 17272 bytes
font_01_sfnt_off000115e6.bin
1d7c75f474158731e8b59a101879bbe7b57e42479446d1d2c283354ca1ebbe06
pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 10396 bytes
font_02_sfnt_off00012db0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 16792 bytes