Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aba5bc9e506ea6f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 08:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5abc0499bb71bf0cdd899d37009df25e SHA-1: 1c00d0f1ef074ca2b47088efe26f90b3ee9901a4 SHA-256: 3aba5bc9e506ea6ff78c168072106d00b85c9bc870c6cf9c56bcd5bf442a64bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://a2designbg.com/userfiles/file/45241611338.pdf In PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/vodebiki.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/56600385151.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xaguxunupudajusunologolo.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/voboluwofawupad.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e598a43c0a1---nuxukusojepowowexubo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9074019a9---posevow.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/uv05qqf4auik3mccv9dn7h7mtb/44066270807.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ff4499a0---gesurufenoz.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a688dc7caa0---62413126939.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nfnlkkkd3vjbljvvsonbuk02l4/nivafidurano.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/670a49687da6b6b25dc4c8e99da9786e/75742796029.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/jufipudanisavibusi.pdfIn PDF document text
    • https://brakos.it/file/14437799531.pdfIn PDF document text
    • http://ledins.lv/cms/file/kojegote.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d9e2367d39bfa7473ff8838ca98ee3df/44242319332.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/pidokilawotejalivino.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/43802436549.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/565b1ab8a937653a2e46d923f0dca463/53496660144.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/9a2a9653651e49e446c826d8a2f9afa9/bizuvamegim.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/n9un7ds04t7urmtvihopc4ogo1/jiroxitimopofora.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/gotowavoputodid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=attain+and+attendPDF 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_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 17532 bytes
SHA-256: 21d375da3181f7999f9b79318fbd255211181d1eb28341ec4055b68547f2ad01
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 9788 bytes
SHA-256: c3496564f6de166d4ec3e4e940d68dbe7d145281b8504ccefe0b0aec3f5830a8

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