Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec089d6f24fa03b…

MALICIOUS

PDF

91.8 KB Created: 2021-09-17 16:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6421f57d8562e20d99aa2e05e1c82e8a SHA-1: 7294ca6e1c0fc2258f6b214bfd57cb0a25d7f982 SHA-256: 0ec089d6f24fa03bdc73ba620abb3c2d6866737e647756ec3feeec1ad055c321
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://synerhu.ru/uplcv?utm_term=you+can+draw+in+30+days+pdf+free PDF link annotation
    • https://spacio.hk/attachment/file/suvifoxiseroxibuxezil.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/43856178534.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/38224469386.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324b672bd1e---wasajelonajomadawosifanas.pdfIn PDF document text
    • http://talesma.com/E/file/14403702935.pdfIn PDF document text
    • http://meskerjager.nl/media/files/49492589804.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/nifaxobajapodanajegare.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/19609718198.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613101bb28ea2---zulatum.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/45693644113.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/89338454985.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/jeninubupoxom.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090411502584.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/jolavareguxem.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/da17eaddba58070f60dfd7d13c14ce2e/xelaxebo.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/77445769647.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/78214221190.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85446a9ce---50153441342.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/35189634681.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/88803004855.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/fevaka.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/vajanukeniposevonoval.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7d45ccac---zusere.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/2775623667.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/gifagetamejulilugufivo.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/vinelib.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/76267565592.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_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 17392 bytes
SHA-256: 9b2c9139604d0b96fb9d64ca6c48f8645415c82a8214ff0270120700f1f356da
font_01_sfnt_off00012f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001477b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477B 11044 bytes
SHA-256: 6aa6e407128974bddcd58dba9c737ae5939ff3848641a65a801b7fe050832085

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