Malicious PDF — malware analysis report

Static analysis result for SHA-256 307eb73b9b20e356…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 09:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 715b492d4321de0cef58ccaebe1e2b96 SHA-1: 5e1bc6b3c77a164f7a025f5eb9025df5759b98a5 SHA-256: 307eb73b9b20e356e02d6999f68ffc522ef9e6f9887340b104c9017dd0504dca
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of an advance-fee scam. It contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary lure appears to be a fake lottery or prize notification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://inwebjor.ru/uplcv?utm_term=guideline+8+ball+pool+apk
    • https://takitech.hu/userfiles/file/telamifixipaguwojipowexek.pdf
    • https://dichvumayphoto.vn/webroot/img/files/61341876876.pdf
    • http://slkuang.com/v15/Upload/file/202198537381538.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141121229cd2---gawenuruforot.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/80403367439.pdf
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/wuluvaporifun.pdf
    • http://sipzip.com/userfiles/file/wasawu.pdf
    • http://h-n-s.net/userfiles/file/77240828927.pdf
    • https://md-bud.pl/szklo/photos/file/kilobezisip.pdf
    • http://silver.jo/ckfinder/blanc/files/65123434587.pdf
    • http://licausi.it/userfiles/files/nojevizatozimu.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130230f7f2c4---kunulezoxi.pdf
    • https://luckyfood.itweald.com/uploads/files/6134d1cc8dbe8.pdf
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/gulidujutakozodexamuliz.pdf
    • http://www.eau-msu.ru/ckfinder/userfiles/files/gewijolakafabalizewoza.pdf
    • https://urologasdainys.lt/userfiles/file/99951535592.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7e88359c195f350a3cbc093926b2381e/fenixivebigokeruvalo.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/tuluzoriw.pdf
    • http://hmed.vn/upload/files/6829330275.pdf
    • http://www.prodomasa.com/ckfinder/userfiles/files/84961229740.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405de09bec7---39083286114.pdf
    • https://31app.com/userfiles/file/37784953980.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613559a952344---90150512589.pdf
    • http://northmarking.com/userfiles/files/51180747256.pdf
    • 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_off0000d63e.bin
87d39c987e3028e910f42285b4070194063b890e2882df49784c3e55d5bfd3c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 18256 bytes
font_01_sfnt_off00010593.bin
c549d636e3600b37d6d7c2dfbfb0ecb4e748ad7b29f06d61941c18875466d9c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 10596 bytes
font_02_sfnt_off00011da0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 16792 bytes