Malicious PDF — malware analysis report

Static analysis result for SHA-256 a536d790e1c013b9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 08:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e14e98a45a09a5a4347945dfae206cf SHA-1: 98f84fc483752cee5f29c4a3654d9e1b9d5bf5ab SHA-256: a536d790e1c013b93864eaaac19358419c8b8d88287e24571f85674e87cf5a7b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://olympiad-bigben.ru/ckfinder/userfiles/files/xiwanotavesiwegefivij.pdf In PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wewonuwoji.pdfIn PDF document text
    • http://foodchemsino.com/d/files/29545483219.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54be2ec7d4---37130545009.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/63faa910c13363f851b022795b0a7445/musovuse.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/45330402297.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210813_0_55_15.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2c2eb29a543af0f5e5ccffd9898df752/vofopurizopekikefelokemeb.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/99708362193.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/597edbd7e276102655e81d8f0cd3d181/jogapekekosifobigevanuwu.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/fumazamitu.pdfIn PDF document text
    • http://ibb-online.ru/f/file/majilalijojajejurixuwo.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/nizodelazukam.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/27235818463.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7dc46175d---lusofasolujadakizekulorol.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/wowotadalopupibirutugir.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/41b8548bce6bc317e30898a95dc6337c/28898099526.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe093d3ba---21919656132.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lvul78jmff6da0ok1cevf50j8m/27397349085.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/foretarazesubixi.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/85758838114.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7eac7c153---kididuzitobiwovanil.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/86003708743.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8vtrk31b134181dl58hc0o50g1/kexifefexaxerekoronuxad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=quotes+about+jack+lord+of+the+fliesPDF 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_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 10988 bytes
SHA-256: 2e4ab734795f1abb33cf41148c3e20fb355ee50e2957ce2d61425c02a4e3c736
font_01_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 17152 bytes
SHA-256: 33980c00cde45cee267d4eeba2c8999dbc81608f75e5ebf4f4a5526a1dfcde6d
font_02_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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