Malicious PDF — malware analysis report

Static analysis result for SHA-256 df65a973771e6403…

MALICIOUS

PDF

81.0 KB Created: 2021-08-12 11:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a5fd6e38bbf606e320939c6464375c7 SHA-1: f65bbd9bd5b8c5f266667c3e1ed22e842ae5de6d SHA-256: df65a973771e6403153f533f23e9a2e264ffa16f2a2ee21bb77afca447f0b7c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609040135a0ea---ripipizopazin.pdf In PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba3aef4f7---41475505523.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/vojinotabefolukilozedi.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210731063717.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc1dbe7b9---zezode.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/7365641864.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/71210889652.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/43a1196ab6b79a0d991072de381a139a/febuxamexivokuzagi.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160881a5f30243---pozuli.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4c307144d5ffff6b339777d16eeb1889/39953924233.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/23091777415.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/90354004837.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210805135656.pdfIn PDF document text
    • https://capecoralliving.com/media/file/zimivekizegutiforubusulu.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/6702936329.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wenimoxumavanapiwotenat.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/89770672906.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/2520316609.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/xuditovupasibawubomal.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/92760172282.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0df76e468---33077727965.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/3307106432.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/dowodazetilelutezagikop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=honda+cb+750+f+workshop+manualPDF 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_off0000d70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 11280 bytes
SHA-256: acc7575bea189ba4c9f84202cfc9a3a72312913dd501638fb85fd16eb0e5bed6
font_01_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 16488 bytes
SHA-256: f3fad6992236d7cb7472ff293c3826f9b3116ab91fb6e67a685e9d7cbc729064
font_02_sfnt_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1