Malicious PDF — malware analysis report

Static analysis result for SHA-256 421250dc1b2a42af…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 03:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8a1963513b3ed476b792ce797c8561d SHA-1: da05567fc43372b143296cb9362b5d7dad28d690 SHA-256: 421250dc1b2a42afc35c5ce1cc1f8331fff3414ffbae5a895d03bd9607b4cd7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute further malicious content or phish for information. The embedded JavaScript is likely responsible for initiating the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c7eb8d5920bdff329122754195c7d698/femurugelododeredufirepit.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfe839660---nebaz.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/vexikiseri.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16129bcf331887---xazerizivinoxidovagusese.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/98f8a86e8b6157afc3a8cddc8dd983ea/5862631327.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7d6a0a9819789a015fb60b395b730ea9/54179029484.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/pefisevadisovijiremora.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/688d3d9dc59e861f5341d3ec85f6bbb8/zukisixebak.pdfIn PDF document text
    • http://pk.mo/userfiles/file/38855154476.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/gawufazewizeterijemiso.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/juvifemukugasimixid.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/63806880030.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/viravanuzogiliwiridet.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af08742b61e---59975505732.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/61242637351.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160865d983f911---nogotomibazegawata.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609103da0205c---nozuwigu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/damotowojivazuxufipekukex.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/71sqb4gf3i04ft016oe5p5r3t1/lomen.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/tetarasewubu.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/92501417913.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/75172980383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+conceptual+framework+for+financial+reporting+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 11140 bytes
SHA-256: d4c07815dedaaca157caa36f9186430f71f50ac021fd411c132d1b6bb17ee537
font_01_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 17124 bytes
SHA-256: 67c84d3a1785f9a83d096de8b32d5403be7ec0300d42638e6862ac72aff92cbd

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