Malicious PDF — malware analysis report

Static analysis result for SHA-256 387547c0ca5a3feb…

MALICIOUS

PDF

74.7 KB Created: 2021-07-22 18:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1c5420e70d0cd4911ba897c83d6599a SHA-1: 3987f2ccac41ccaf319fe633753d82139cc7c277 SHA-256: 387547c0ca5a3feb13b33b49161b1ac52ce9d7f4905425777b928ba842c4bfb5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The use of wkhtmltopdf suggests it may be a generated document, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8370

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://ludifrance.fr/userfiles/file/befarivuwolu.pdf In PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/fomipojunijatuzev.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8ed59a58---13408590907.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/dfc628de9c93c2498f48d7920209fe3d/50097025711.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/vevutazo.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210629212455.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/timonepidalase.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f6e35d37---83929721749.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/27221539975.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/valetovadur.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b8b9df63c4e801d204446c6872ece331/79928469303.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af61ad7fee---vibep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd9ec0fec9---93236873899.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1b9e2ea8---59389655242.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/juferafuba.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/cdedd2953352dd0718485e3031580b46/38560395620.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8b1599b52da5fdf80e3db006f331647e/rapuduvovezivulipiseziwi.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9d0c0a149a66007bc479429e62416dd0/52006854571.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/15a0d23e81177939a97aa24a604bfde6/53565979272.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//76171702820.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/sumuwezagasajowiz.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c217c7b50e1---66146420565.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d09d492ce9470d8f5286a5e0692b25e3/dinaxagoborexapikafane.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb1d7198c6---28875506049.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xekeboben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=1+molal+aqueous+solution+of+trichloroacetic+acidPDF 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_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 16628 bytes
SHA-256: 5b2ba3f5f1838d603d2d51b16e7a96dbe4df9a89108a4f9a8066183b9d6e3c81
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 10940 bytes
SHA-256: 871551a27bf03023b0541618f01d858189440412a7e3ac60286344a91bbeff42
font_02_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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