Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0994ae484615508…

MALICIOUS

PDF

69.9 KB Created: 2021-09-20 10:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acd874a8e9494c05a9b26dd21284b294 SHA-1: 27528580e7cdb5037fe4f98acf6564308778f163 SHA-256: d0994ae48461550845949c2d2b0307b2d133c2208ca3971e6e3fb58da29e14e8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, characteristic of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent. The embedded URLs suggest an attempt to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/64831facc6f6dd76842a5ab96135ac28/kikogesitatif.pdf In PDF document text
    • http://agro-norwa.pl/userfiles/file/87365323010.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/ranugarop.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/nimazukuzu.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/31301044129.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/gagoxepegoku.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/mozinajedirodazirofusuf.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210919074648.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/69123915419.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/44119523334.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/11551838593.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/vojuwomanuwaxis.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134319acc9fd---lilisezusovulaxeriragogo.pdfIn PDF document text
    • http://hueide.com/upload/files/xurexoni.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/tokusegimozirotaxulusoj.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/kiviratekipagejekeforat.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14986779999.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/17517206955.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/50844267747.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc45a825b8---96182625670.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/49806111737.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d16e2942f---geduloputoxida.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f71b658c---dudijugunu.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/8824273502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=jawbone+up+app+downloadPDF 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_off0000b58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58F 10244 bytes
SHA-256: 5fde03aa2a6b022cc6ec43e64679bd3ad9cef9ad0450c28d67691406c292025a
font_01_sfnt_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 14804 bytes
SHA-256: 5458455fe1b6ebae116306f83bac6152a36ee95f39dba3d05956fbde16063013
font_02_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1