Malicious PDF — malware analysis report

Static analysis result for SHA-256 520309637f14dc90…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 12:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ebc6c49e9730d41fb24ebb05b1ebde85 SHA-1: 128e0f581ff745cf12cdf08ed656788a5e03d92c SHA-256: 520309637f14dc90b0a7afa1219654471219d994c68bd49e944cb6179b5f3ab9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript points to potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=grand+theft+auto+v5+obb+files PDF link annotation
    • http://thaoduocquyhiem.com/userfiles/image/file/woduwidemi.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/betakolebamujipos.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///34062553441.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/fosigixapekowakebunegoz.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/ximararakeguwideleselajek.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/xirutibajunali.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/domika.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/12726096451.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ab1bbbb2---mopiwav.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/60d91a32cdcf630fd3d0ceaac741f63a/69874613274.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/25479990899.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/fudararozasewarofirowino.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/bajegijabufuwo.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/nidakegur.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0d36924a4a251e94f975333a8c663f57/30599630905.pdfIn PDF document text
    • http://balalajka.nu/media/40888423348.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/pafotol.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/befuzovekoberalob.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/67060472891.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/96206228412.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/jixuxatavejok.pdfIn PDF document text
    • http://telecycling.info/files/file/42151528871.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75257383741.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133f4928c1a7---kepuvafavimik.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/27050100147.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/89581753052.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/85912249701.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 10928 bytes
SHA-256: af955500e743b2f4e976e7944cb04c04f486c114eaeebe90d7d362e069dd0d02
font_01_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 17440 bytes
SHA-256: 8458b669d4fd73eae778f2aa4cb7be0f46468b114bacb77cde9f42e8322c8f02
font_02_sfnt_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1