Malicious PDF — malware analysis report

Static analysis result for SHA-256 8132d94f5e1e3309…

MALICIOUS

PDF

88.0 KB Created: 2021-09-04 23:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1baaf2bbc0cad1d1f4baa76eabee7752 SHA-1: bacd4043934660c421a7403c373d3dd3f036ce5e SHA-256: 8132d94f5e1e33090c35e432dfc745253a3d1e4f4b97b4b2f81254c2f0c5193c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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 http://marinda.ru/pics/images/file/wefipogiwegugita.pdf In PDF document text
    • http://zdrowejaja.com/Upload/file/84727249653.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/nawugibebiwefixo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160842fd68e9ff---19639486745.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/49499404821.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16129a69661247---87848807571.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/8657368c213b73e2c0ea3904db31b4a3/39422561700.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061606174280554.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/riteda.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161103508873cd---varalekuzujodevasexifuj.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/84771040642.pdfIn PDF document text
    • https://bombapin.com/calisma2/files/uploads/78183781011.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/141jhog9o7arh602pqehv6u1bs/mubudij.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/gilizumovovivo.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/m0r4lsafdckpo64fv07qmpav4t/foluponagaxifepejatadipus.pdfIn PDF document text
    • http://schubert-hh.de/image/file/fisinedexaz.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/55181962551.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/68529eebe9a1ecd536035307edd3fb43/gisebenitesorepatuwodi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pitou4n2vvorihs0sq5rm9187p/jotaj.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6cb884f3b---36537381122.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/12913626649.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/96212095572.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/89856635172.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160adc88421aec---medipevupejexefujigoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=omission+exercises+for+class+9+cbse+with+answers+pdfPDF link annotation
    • 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_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 18532 bytes
SHA-256: fca6402e9ce570101a94240db638acfa74f6ad95b602f1ee7e26590cf15c4732
font_01_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 11408 bytes
SHA-256: cc80054334e20ff4755fb0c18630eee13c88d263e5faf13db1263d98b8ad2d81
font_02_sfnt_off00013a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1