Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f8840a1ac44cf3…

MALICIOUS

PDF

96.9 KB Created: 2021-07-04 18:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8a2a75108d0c5921424f4d6bd2673c18 SHA-1: 3dd30f016829c30806e7fc40020581de6d802668 SHA-256: 58f8840a1ac44cf32724d60345607d037f797c1d926aa5a475e8d3fb34d28185
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious sites for phishing or further malware delivery.

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 http://www.gesas.it/media/mailinglist/file/luvavanureparenozalorufun.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0c576928---53390755113.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/evs09eaq26e95mp2257g26sr34/daxixukulupesizodo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc2a814fa---18148062213.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/9hfrc944rgj1imll4532omcpdt/xobesodijivos.pdfIn PDF document text
    • http://yilip.net/userData/board/file/bororafifadovijirekinoba.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/wupuwetesebezufijenorik.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e406f60411---16424198211.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/63361131461.pdfIn PDF document text
    • http://iworking.vn/uploads/files/77717017678.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718fa6bf8c---kiraze.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/kevenunomelejiriveki.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/53966379075.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cba053b0c91---35258257994.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/wakedipofi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0oeaams0n5rqseq30q5cjfunmi/vakotef.pdfIn PDF document text
    • http://epmachine.ru/d/files/pexipurikelat.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27522975026.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/67527912589.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/doloxetazamekegokaxopofem.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/6118123082.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a01068a0dd2---85453631714.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/nirifutujotixugatese.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/lesowitesomudu.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/331bb2f9f096fac78f349a34f28ef2db/59957736220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=roman+uppercase+lettersPDF 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_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11458 33044 bytes
SHA-256: 43ee22f71e55982efe7c713077a27728cd58b405dfebf05d2a6e082316e88fee
font_02_sfnt_off00015e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E72 10588 bytes
SHA-256: 23b9424c42795a842c6f7d095aba5ad83dd4f0912dedf7d1ec29c6fc272e1351