Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b58bfc42c0db387…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 12:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b930cfd9ea960d70506dbd936a9c748b SHA-1: 0c3d071b5e9c17878a5e9b58d1490e8b441353b3 SHA-256: 4b58bfc42c0db387045f9be68600a337cdfc9ddcb382e85b85237642f143c1bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with one heuristic specifically identifying links to compromised CMS upload storage. The ML classifier and ClamAV also strongly indicated maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to potentially compromised or disposable hosting, reinforce the conclusion that this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://psg66.ru/admin/ckfinder/userfiles/files/guzupokoxikibufafive.pdf In PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/948319b982cf5fb48f1a5441f986c440/zorikuleminirova.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/konilefezonevonuxupegor.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/7d34f7a8c006590f61e86219b74f79f8/8895886764.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/31150865233.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106140136299588.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/i0158l643h3encj0c4vak6e360/55698026598.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/3254206795.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/fusugegadunow.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/buvufukazidalopeg.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad15d0dbf3a---48265528605.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/kofajuwuj.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb723130bd---23317521211.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/mezugapuxi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a821968adb1---savexejanowemotev.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf00fbe2f4---62245735518.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/pddbl7558n5ns3hbsfgve2smj7/21617419001.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/mvt8roidq69hogp77me8n7e4l8/wipuveviwobagifelepevu.pdfIn PDF document text
    • https://hoalavender.net/upload/files/33562825006.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/tediw.pdfIn PDF document text
    • http://jngf.cn/files/file/2211233724.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e3110243f7edd970664e12e738b5dddc/61670818431.pdfIn PDF document text
    • http://web68s.com/upload/files/21390199680.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/88554776035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=global+threats+to+human+water+security+and+river+biodiversityPDF 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_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 11180 bytes
SHA-256: 6a5bf3681ea52eebf0a33e0499a933ea6803f8fb8b92664feb1338b85a3fb3b9
font_01_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 17020 bytes
SHA-256: 85bcc7c6dda3afc37d363ce8d0c2d56b7743b5ffbe8dd5c602627f243d89ba62
font_02_sfnt_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1