Malicious PDF — malware analysis report

Static analysis result for SHA-256 d305a5bc7d2d3dc5…

MALICIOUS

PDF

87.7 KB Created: 2021-08-23 13:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff6745a22d142e6682338e45da94b14a SHA-1: 93e6cfea3e23f289cfa2561d0b0f10f4dbcb4fd1 SHA-256: d305a5bc7d2d3dc5247c61a4e014bdb89c36b7e9df3c6d8418e03b217dc6bea1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://burke-gallonfamilyreunion.com/clients/28163/File/42687458928.pdf In PDF document text
    • http://www.mustwalge.ee/data/content/files/63498722718.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2efe7a4bd8---29917520663.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/64745735220.pdfIn PDF document text
    • http://becucci.it/userfiles/files/japasekupelopakamosexota.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/wifakibiwuwigujen.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddda6667a7---zikovuxize.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/aebcfaecfafd90e689e67e4b56674337/guzigevitokofadibadiriviw.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qe9csb30hm8scbdhkac28g00l6/majel.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/550efd2042b4e9f09db817f8754ed839/64744872518.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/xarowuzevisixasozaz.pdfIn PDF document text
    • http://industra.sk/userfiles/file/larazofewa.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f7cc792b---gatepejunebit.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f864e37b9---85569969622.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8dd2251df---rozifenoderorejadij.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/buvumijutefirazo.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/41671039973.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/36590356212.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/foxumutubekogudetilatatip.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/migew.pdfIn PDF document text
    • https://csodamalom.hu/files/files/malelipukimigugepuxa.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/1d730d60e05dc5ed75f0419fc402191f/74522597035.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/afe4f070a2b1274fbc64ccc8b1bbc440/mazaz.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d4e09f53c7fb249cfd933a1cbe0bcc26/56754555315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+you+make+carved+pumpkins+in+minecraftPDF 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_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 11184 bytes
SHA-256: 5a37b2c36726fa2b641cffd16988ccd76eb2168c2d28953e9c623a698bdab120
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 17088 bytes
SHA-256: 18bf613dea450197f7538c84cdaee75eece462ce6535e5bfe715b1553d665dbe
font_02_sfnt_off000137f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1