Malicious PDF — malware analysis report

Static analysis result for SHA-256 62554781d124e17d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 12:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b3a26755a98213eeb9537e5a1f1829b3 SHA-1: 4b17453c608a2fc2b0e28b91033e198455515592 SHA-256: 62554781d124e17d2561d19be8c2fb62957c6c7338a4a049db2238de11aa9648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=solubility+curve+worksheet+and+answers PDF link annotation
    • http://www.sudaff.com/pics/file/49047374681.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kkc4gf16jks5h2jh69nkdnsoj1/61703999795.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/xusen.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/61975701941.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/vorokis.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/munase.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/1794168119.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/120015215206.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/89579490783.pdfIn PDF document text
    • http://asztromiskolc.hu/ckfinder/userfiles/files/vofagikopobufemibemawivo.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/tuwokunepulotomezisedijep.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/70773462917.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/vuwola.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/a5hss7hokekk45a7m7hbqoen82/nunafire.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1415e3441876e96a83ff6433d9c4247b/46168508402.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/20955409621.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bcecf5fc---kapedipubimupalaw.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/391b9f1f7063f1c495d35aee8f20886d/gaturareforoxanifesokukem.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/60166656458.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/30845347796.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/90531660315.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/in3p7t3bdpqpqh8600479fmren/88856043769.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081421c074f5---19397133427.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/wefivorewisakuveb.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/1387136238.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF22 16392 bytes
SHA-256: b902b04b0d898fa786fc05a32d5726bcdb879cdab1aa9e3ae435c7d1b3752bd2
font_01_sfnt_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 11140 bytes
SHA-256: ca0b014515a1ef33c6ca8111f401fba9634ee1610a3e4324d9be46eab6cc8020
font_02_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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