Malicious PDF — malware analysis report

Static analysis result for SHA-256 5322913639690de4…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 08:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dbabb18722cbb42b5ba4f8553a81de72 SHA-1: ae97782940a074afdeda951eaeb398383a4cf566 SHA-256: 5322913639690de47557c05411ca59e0b65ac572ee56da945af2898f9558a192
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including compromised CMS uploads, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://minipowerpack.net/upload/files/26762444875.pdf In PDF document text
    • https://ethnicacademy.com/userfiles/file/kanafevaruzadiwiwagabuzi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8484850d---jasarinuwukepuwagewe.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/3210837879.pdfIn PDF document text
    • https://gilbertems.com/videos/file/97227839295.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jorixafukogorumod.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/bedemovaripuresofa.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/netomoronozawemusesigow.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/gufofakax.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/muxefevedixajerasolojuxu.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/53c78235fa6df9f58a339c6764f5813d/32868705439.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/kazodanogeno.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/34825311396.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/54818890710.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4612136ec4d65573ed03a5967359a6c9/50350792105.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a91c7ba0e5af6a2935ee147ae3260495/xovexoxibob.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/geruga.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/79663023782.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608191b186f31---59987288727.pdfIn PDF document text
    • http://yaan121.com/uploads//files/202108131806425976.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/94106748718.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/tumivuxokidax.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/90660173476.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/lubopunulatikin.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/70445720839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fly+fishing+for+dummies+pdf+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_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 18324 bytes
SHA-256: d84439a2cb1370bbf9873d92d4df06703547375c1cd257014a31ec3c10e9c2b9
font_01_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 11124 bytes
SHA-256: c97f0b997905ff1428cc78a91252f8e2c3b8496287da77d99e54c9e194549ff7
font_02_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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