Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0b15cc35fb68bc…

MALICIOUS

PDF

78.9 KB Created: 2021-08-11 12:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d45bddde09b532c17cc0e72761c56fb3 SHA-1: 3e2bb38d1033854f7d73fc3056fd00f55d51ac7c SHA-256: 6d0b15cc35fb68bc82d0ee3e67ee7bb779950ee20cee7620f89425e9d54e2f2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs pointing to compromised websites and link farms, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://huntic.ru/uplcv?utm_term=ibrahim+tatlises+allahim+neydi+gunahim+mp3+indir PDF link annotation
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/sabasiduzabulemarup.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed247bf64---dazukepepezebefivaligetur.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/zelorowolezamuv.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b93d1c244---32165069372.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/lexuxitogesufijuzis.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/rizivavurozogolipe.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/44616904594.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84bb459f05---bubirenitikovofuxexibile.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/33424743669.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/josakujixufotasusesepati.pdfIn PDF document text
    • https://bursac.net/userfiles/file/30895603186.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bnnv6jkvder3a4hbkefppgqum4/83722176103.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc7c65c5d---jebavitubuferudi.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/verev.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/vedijegapipi.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/dodoxubosopuvikinenaf.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/43850206982.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/78204083054.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/duzabubabexezifogedaluxij.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9c502cf4ea6cd7f1da63168e916544e1/96191717622.pdfIn PDF document text
    • http://poiskvod.ru/images/file/sibesudega.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/4baa3a715985ee69b3dba31aa3e5911a/91016743221.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/7cd521d6feed6ce4c043c2c551439739/diposepoxutafi.pdfIn PDF document text
    • 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_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 18628 bytes
SHA-256: f54135bafa579d7143444b9027a76ba1e265545c03bcd5478967a99f688b154a
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11137 11196 bytes
SHA-256: a1f851b7527aabcd9e26722b914752a42d4fa87764426eb9c56cd229e6201df4