Malicious PDF — malware analysis report

Static analysis result for SHA-256 531fcded90fecc07…

MALICIOUS

PDF

84.6 KB Created: 2021-07-18 12:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81a38c3bfbe572d0278f71d0cb531ded SHA-1: 5c52a7f49d538e6e0b2d7855845290eec05e51e3 SHA-256: 531fcded90fecc07a3ff68e827b1f6f3376a041ba3323004fa2210fc39ccd24b
126 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier clean score 0.1139

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 http://jagatjyotischool.org/jagatjyotischool/userfiles/file/38345431603.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a982a97af2e---mogefijonazomu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f06381fcd---31298003859.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/fetupelus.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///86412217539.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb9bfc86d1---48611006920.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210604_EC1EC99DDEB00AFC.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bejaleftcp32sibhv40bnlpuh1/2994539850.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/9183463960.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/tesajogafofosovibikozaz.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nuxiludaguwave.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/disuminobewixo.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/67238337568.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160701841f2667---xetipenusalituxodotifo.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/se0imgc0758tl6u1qho9o1j4bd/futorav.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b3dc46bfd5a19136f263d0bb14df4c68/94433014517.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2efc2ec2d9---vatagivosup.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/powatekigumafinetawiliw.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088743144a53---99009499007.pdfIn PDF document text
    • http://charivne.info/images/file/90993932335.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/tamowinomedixuwesizo.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/38404651803.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/rjldm20vrfghh4jt7m36d77uj1/72865258618.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210626_BCC1ED2BF1BD9BFB.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d92d08da6---muzafovuxojil.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/25577985362.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/36981173693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+resident+evil+4+ppsspp+iso+androidPDF 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_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 17484 bytes
SHA-256: e81f823a9e235b7a378a2c5a1dc0ed3df931000706aaea831e2e7a9c2276186c
font_01_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 10616 bytes
SHA-256: 3a0a0a3ab62bca23eab7c08c315dd564e16bbf3c745cb19f85bdb17bf7c0e848
font_02_sfnt_off000137b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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