Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76d840f18875c83…

MALICIOUS

PDF

94.3 KB Created: 2021-08-03 00:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec8866c706cb9a1ab633d12d466c26cb SHA-1: 64212245784cb59bef0b7179bc5044968503c808 SHA-256: e76d840f18875c839d26110dd43ce3b15b713aa7efbb997c3a3ea5e6cc0808e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV. It contains a link farm with numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2619

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.
  • 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://cafe-malaysia.com/contents/file/63536172743.pdf
    • http://arcomproltd.com/userfiles/file/13285117650.pdf
    • http://shinies.ru/img/lib/file/74252217797.pdf
    • http://avalon-essenzen.at/userfiles/file/ravenegesubuduk.pdf
    • https://elegune.net/files/galeria/files/30526948236.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/75499f51a0d7bbf5826f3fdc7326539d/93633930169.pdf
    • http://train-in-japan.com/images/blog//file/94405860244.pdf
    • http://parentini.it/userfiles/files/9186052328.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69b10d97c---pijawilarobupuduponujufav.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/30383192192.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e054ded761---gupijejelofumusapami.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/fc80b0ad181d3a174592a86d6c20e285/dipuwoniti.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d5c671614---27983365395.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dheeoq7m1632cgo1vnb4gp9r20/39014193131.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d60e40d3d3a---19021801577.pdf
    • https://bistakalikotenetwork.com/userfiles/file/39090714083.pdf
    • http://heibldr.hu/FCKfeltoltott/file/kudurawuj.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab214f049e---duritozewomobitapena.pdf
    • http://chromatographvials.com/d/files/90629657853.pdf
    • http://childconnect.com/swi/fckfiles//file/35119395790.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e770df45fc05d0bac7efb02576807887/47787392790.pdf
    • http://allmedicus.com/userfiles/file/13234300008.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/roboxazapodivelitikubezuw.pdf
    • http://schokozentrale.de/idata/35601985162.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0986172c475bba6b38a21527671feb7e/zulogorumigunakoj.pdf
    • https://gbagencement.fr/uploads/file/bipejafifonakazelawixe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+go+to+the+moon+in+minecraft+java+edition+for+free
    • 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_off00011911.bin
05972088ddfa24a8fcbebaae64be530ad350483bc604e3ff929350434bba321b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 11152 bytes
font_01_sfnt_off000132bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 16792 bytes
font_02_sfnt_off00014ad1.bin
7fe72df02caa9e3281db66b9d617557ba5b200d173b3b73695c521b08ac454c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD1 17700 bytes