Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cae8f0869024596…

MALICIOUS

PDF

63.7 KB Created: 2021-09-18 07:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 61091c5133533687896a363353b01089 SHA-1: 67908c1745d1f290aa04d7091108e29565b232cb SHA-256: 0cae8f0869024596b49851aaabb6f6c8e19356b276f5edae699823376beb456f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://studiopignotti.it/userfiles/files/44150684641.pdf In PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/bazipesabolakixa.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/buludenasofupo.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/60789784952.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/j5arl9vtqnng4tppidpaujoi8j/sawipadov.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/lasavijumeravekizaw.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/71623703598.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161409e8c9a16f---nasuvinuj.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/24482a8fd8b45a69766e2f83283469d1/45802966052.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161312e9df21e0---jirolelowaguramilodufer.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2s6r0etetevebbhpqfb3uqatq0/kosagaxuzezewurabazi.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/93081588059.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/991954a6ca996debc7ffde4af18048a2/kifokukodowotijotiruka.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/45160917937.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/17443371109.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b567d3aeca---seritupibaxawe.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/tiwewaludirozusiweb.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/divef.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/59352575157.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/51984800515.pdfIn PDF document text
    • http://safarang.com/basefile/files/sibelikumavabib.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/96894083748.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/31291001660.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/malajosipirikavuxijaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=soccer+manager+2021+mod+apk+downloadPDF link annotation
    • 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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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