Malicious PDF — malware analysis report

Static analysis result for SHA-256 448752f08e56d452…

MALICIOUS

PDF

76.0 KB Created: 2021-10-10 00:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 47d2b4971a4fe5cb69a837645dc84588 SHA-1: b335097ff248d9978640b4b2cad209c869220fbd SHA-256: 448752f08e56d45241d957bc3aba26c317151b33908ce406acab88480c65900e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs likely serve as landing pages for phishing attempts or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://medvor.ru/uplcv?utm_term=a+bcnf+is PDF link annotation
    • https://aymfly.com/aym_image/files/xofebanibegari.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613677ac415ac---japobuzula.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3c7bde99f26367f10da10515a8a446c2/52945292136.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/51652631428.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/30864502564.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092622423968.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/28335784780.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/31794135425.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/60095784227.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/vexilagifepu.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1633813645.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/wurutigejuriti.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/simazumunatofixorewirazi.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/muwizizepesu.pdfIn PDF document text
    • https://rjpexport.com/files/metubenuzi.pdfIn PDF document text
    • http://webursitet.org/Files/file/92484392049.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/93960553978.pdfIn PDF document text
    • http://tyextractor.com/d/files/xetumu.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/44520098868.pdfIn PDF document text
    • https://izr.fr/files/fesegametegirenavuzizozad.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/xepuxuxemomexesixuxuzug.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153da93aa268---33519437324.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614513c2ca08b---99291153612.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/58082186125.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/buxis.pdfIn PDF document text
    • https://afma.pt/site/upload/file/lasugatunimo.pdfIn PDF document text
    • http://totoumi.jp/upload/file/mewajuxuwisuxovopami.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_off0000c48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 9792 bytes
SHA-256: 77743f31d025313d7c61bb03a5c94fbb6a1e46f2af9856f8b6cc48601539908e
font_01_sfnt_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 18232 bytes
SHA-256: f2d639d26e73e58231fda03ddc69e516baeb230e1458cd4f0e14af40b03bfe71
font_02_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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