Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d3bad6bd443924…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 05:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ec64e039a404deb81c2f65029082636 SHA-1: 49dae120b7429b2031d24e10ce9249d979b5ddbd SHA-256: 58d3bad6bd443924cd2a986a2ea9f6430074672a2972b994aed097cd433d5609
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/63624024713.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/38977375934.pdf
    • http://napiarsaigh.com/images/redevabebanobixanati.pdf
    • https://isigakizima.net/img/tmp/file/76623328814.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/disugurojerumewetobuwi.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/78814239846.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210906230600.pdf
    • http://ttworld.hu/uploads/content_files/files/fesefixuxopozitoxaz.pdf
    • http://wittlich-luexem.de/userfiles/file/72616221892.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161393a78e127d---7664128069.pdf
    • http://studiopedrazzini.eu/userfiles/files/15166641259.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77d3242a1---60811636161.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/96249140034.pdf
    • http://fszhenjia.com/upfolder/e/files/20210909054731.pdf
    • https://rmduncanrealty.com/userfiles/files/podavupoliwire.pdf
    • http://leaguengn.com/userfiles/file///96104383417.pdf
    • http://satyamtracparts.com/userfiles/file/womozuzabuxavula.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132b200c590a---mibekajudulerowujo.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/hnv3poi4v4siphml00cd1avfvh/gefovitemukofoxonanuruwe.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fe7ebc4c1c587faeca0fad4b47078c61/nejawepiveme.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/674b24c0482c1d61add81bb20c545b9b/93791609512.pdf
    • http://www.radanhorse.com/resource/files/ripadugak.pdf
    • https://khabul.mn/mmpa/userfiles/files/69524223783.pdf
    • http://xatrbio.com/userfiles/file/90288591038.pdf
    • https://ms01bet.com/contents/files/9613559939.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=amazon+for+android+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000d96a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
font_01_sfnt_off0000f17c.bin
5b0119f9cf1581b3db4119c2e38c09a0e8a8f23a6b427df682d19290df644dfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 16816 bytes
font_02_sfnt_off00011d5b.bin
2215e64d4e1373f25d10cea7e54a07ccd3166d121c3247cc14848f5edaec8ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 10348 bytes