Malicious PDF — malware analysis report

Static analysis result for SHA-256 05377500b387775e…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 17:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b34a2884c2300232a06bb15e340dd37 SHA-1: e550f7d0cd026fb1f2508b99014675bbba70e3db SHA-256: 05377500b387775e20e93f5ff5029677ff6d125b2a41ecd3775b1068cdfd2ad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sns-russia.ru/userfiles/file/77153298977.pdf In PDF document text
    • http://wohntraumgmbh.at/wodiramuworamibimeteji.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/go7lak89h2paj0isatugq2ati4/960255873.pdfIn PDF document text
    • http://nensi.si/upload/file/texarubodokakafivepuso.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/venijinipapekinemoda.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/guzana.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b78c2cce40b---vugodiludopo.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/mateforaxomifakelewijad.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/50782359560.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/bivevugawuwutapuwupowota.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/1863760242.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d614592f---54987569356.pdfIn PDF document text
    • http://e-sheremet.com/img/tiworekeme.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mte5fp5hu6ce80r41adottim34/25249429757.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/78200092361.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210801175028.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/gofuverixoromaja.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/fororewun.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6708e44bc---kavufoxajoxif.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/33295653896.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280836252562.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160da717fad314---46630619822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=lic+reassignment+form+3848+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_off0000bd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 11332 bytes
SHA-256: bf057563cf1b0c1a6321cfb017c59912fa184f0c473bfae5293e70a7e7de8164
font_02_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 16216 bytes
SHA-256: 307d3363e935f4c12fbb50427ee33a37bdf0c6f5501c1596273793dbcff79e3b

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