Malicious PDF — malware analysis report

Static analysis result for SHA-256 f250cc6c1827b323…

MALICIOUS

PDF

91.4 KB Created: 2021-07-21 11:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1bb168842407f8f5145abeeb6678eaee SHA-1: d9e1d5b67857f3b584f98084bb270177c81a4931 SHA-256: f250cc6c1827b3237765666c8b86e626ea2f9232eaf65cb56e8eb497a50611b6
126 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised or disposable hosting. The ClamAV detection and heuristic firings for compromised CMS uploads and link farms strongly suggest a malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple unknown URLs increases the risk associated with this file.

Machine Learning

  • Nyx PDF Classifier clean score 0.2214

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://sns.hu/_user/file/rodone.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11a1a0a840---76338547041.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/73446125028.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/94778793241.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c138ec58a39---birepekifi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68361d78b---tigubamuwu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d0dfc73d0---60838880197.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b6427b256---fimenelinen.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/kuwepilagapabuzuwa.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fdab3f60579cc25d26d8b758a76fcdb8/83105763802.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535687226c---80476141476.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1385db25a---38584662458.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/32914980932.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/6dcb34c15cd8f03a8e07e06acb28deff/dogapenevinobututapekobes.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hrck2sd6enfsvt43vek2ocb98j/nilidi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mchtd0m13nuqi5bchi59084k4e/80441058216.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b97b869d9848d7eae27d7f19571afd0/febugoj.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/gefowiromafutugugudozaj.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/20299671096.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/sowewonusalujuvakivuwa.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe0b4f485---53270568916.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/86428053787.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/55461698692.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/40879325116.pdfIn PDF document text
    • http://www.bash.cl/media/file/bakasixim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=basic+input+and+output+functions+in+cPDF 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_off000109c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 18488 bytes
SHA-256: d62a4fee46bf97cd8d47dd5162591b63a330e16b00500ebcfda6b147483ac5f1
font_02_sfnt_off0001533b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533B 10488 bytes
SHA-256: 26938f44a3093a5f98830d7091212679bee16e4ed887f4d6be2a7dda620c34cf

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