Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b31fde9c88f5d9…

MALICIOUS

PDF

93.2 KB Created: 2021-07-08 10:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 246a561e7b38f1a36dc08e2ffd6e72b5 SHA-1: 95a3746b5f25a7be6088e20d4402b263efd7733f SHA-256: 56b31fde9c88f5d98f3c9be5a11521b524ca18aee9cf5ddde6ec8aa41656fcaa
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL heuristics suggest the document's purpose is to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pabrikangka.com/contents//files/xumetaxavovil.pdf In PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5d2fb1de56dc890f66a7cf63f7320d5a/vexosiretevudapeg.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/24371523231.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/bomolixoxufonebogof.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/70980271363.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/fojilodidepowovo.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/55982189971.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/74143301619.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ef24fe922d1f292b17831f13d60c6006/zotuvegasariwudodub.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1edef145af---35477387573.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/85463724735.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a422413c6---42238957705.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9f00ed3d---54978024009.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bef72fc3c18---46792353841.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/v1gs5lfa7leqj44f6sjo7gfd1f/jozopakefagademowulejo.pdfIn PDF document text
    • http://jarosi.hu/files/file/kewewewetawuwabid.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/3mgh8vhgsqr3t1vi40hiflmkec/pemoxavorogujol.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/0mb8vun4gm61q3gguilgfq2ges/58185826015.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rp875ooki5sv08mbumn2isgq33/37745826424.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/tizogixokape.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210606_134614.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/nevixuwisoposavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=simple+snippets+javaPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a7ceee253d7c4cecb7502dfc849587df/kerisubojizavobavisixadu.pdfIn PDF document text
    • 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_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 10464 bytes
SHA-256: 427ec754834eba593fe2245e707f5c1189d4446b949d1a355bb14349c65aa199
font_02_sfnt_off0001377a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377A 18084 bytes
SHA-256: d949a747df6c9dee136714be15f4dd1ff821b4d890e275d5972c7aff104dd78c

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