Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d5a71276390349…

MALICIOUS

PDF

88.9 KB Created: 2021-06-26 04:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e611b05ee7fa8681890889209ba755f SHA-1: 3ceb51e5e3b8e9b15849c5d79b4d6fc9dd435968 SHA-256: f6d5a71276390349cbdee37316db26216d7a1144a6a093ee3dfb1c30bb6393ad
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of multiple distinct hosts and the structure suggest an attempt to evade detection and maximize reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160726913666f9---xuvobezakumobu.pdf In PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b1990528b---11104490251.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b8f06ad77cc1f09c1fc4a3d0644f38bb/vajebajetesatoziwekeju.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c1ab4ca06---68919184444.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d7007843---37971420964.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/zijovedororiwadevad.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/71200327048.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/cc20d6610330fe66f7568a514130165b/78536234024.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/19540435619.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/dinakalajifezotanoxabupob.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160834b0ccca51---fesodusibinuliwisewoxojis.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/89379599650.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d31d9179f1381c8ebba4aeabfd70537e/zukiwuvafetevode.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/rugit.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/36562010032.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7487733f1---wetefuzozadikut.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084190d21ce0---zitotuwivumojizisagu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec009a5df---katomo.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5284_20210524043205.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/hiu0hfd622iq7c98boj1sh90qe/jerevusupuxaj.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc56132672---81236031344.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/84655957996.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/vodeda.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8c3980425---18462990135.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/penumedexi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf629b8e3a7---fatoveg.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/vaxudomunigopevov.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081041c2b338---43646586148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tax+free+oslo+airportPDF 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_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 10312 bytes
SHA-256: f17f3481e01245862936784a2c07b4d83c9e049f450a90429a442b4121e60b70
font_01_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001273b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273B 17888 bytes
SHA-256: 2815135afd39cf4941bdd18c92ff8838939a6a4c3977661d875fe25ae82e526a

Open this report in the interactive analyzer, or submit your own file for analysis.