Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacbb59e783987f1…

MALICIOUS

PDF

64.0 KB Created: 2021-10-04 16:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b1cf2ee4e5f5cb7d757cdae71824d34 SHA-1: c53d7ebca906988f91b9bc40abb90d8fdb95bab4 SHA-256: dacbb59e783987f196e7019283d5864ccc22e41bf5907870f4b6fb673c07f99e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, flagged by ClamAV as Pdf.Phishing.Trojan. The heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6736

Heuristics 6

  • 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
  • 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=ternary+operator+in+java+for+3+variables PDF link annotation
    • http://studiomontironi.eu/userfiles/files/45572277521.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/20149656280.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/bulisilofodapewob.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/vadizugezazutijiwamos.pdfIn PDF document text
    • http://clerus.hu/files/file/7258642764.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce3234821---12950691700.pdfIn PDF document text
    • http://friulanapanini.com/images/file/31434359634.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/77311870687.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/88483329221.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/bijekas.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/wuguzavubuleritufotidubi.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/809790020.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8kjotal7gd8qgqafpcig0daihi/pidukodabimaj.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/dejupavafeno.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/mewojejinafiretixixip.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/79524366775.pdfIn PDF document text
    • http://identik.hu/editor_up/kedojutedunirujojefuwuge.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/61591365935.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210902114706_585722616.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/49566125411.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/rupogoz.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/nomusenofifunewis.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/6943950570.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/eqob8sgoa74qb82a85k04n3on0/97029257467.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 18324 bytes
SHA-256: 867191e4efbe70be0e491c0354996243bf18dac05255fa7af923ae88e9f11d0e

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