Malicious PDF — malware analysis report

Static analysis result for SHA-256 b249ca58857e2710…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 07:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0edc53ed14c6487f02317edc1b477527 SHA-1: 8a64e83c4d84828c30abbbb085a36e7a42cbdd7b SHA-256: b249ca58857e271047d3f73c6705dc69da3b8c91957f51b7bb6f486bee9f142b
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates that the document's content likely attempts to trick the user into installing a fake browser extension or update. While no scripts were directly extracted, the presence of numerous external URLs, some pointing to compromised CMS uploads and link farms, suggests a phishing or malware distribution attempt. The document's structure and embedded links are consistent with a social engineering attack designed to lead the user to download and execute a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://satyavnetworks.com/fck_upload_images/file/vuwogugowok.pdf In PDF document text
    • http://tfforming.ru/d/files/tomamevokoti.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/mirivifidumel.pdfIn PDF document text
    • http://iphysiology.ru/upload/lexigilusopuro.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9ac00baf---muzuwawaxopigozebifir.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/kulewakabosebejajakerizex.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/rogikujugolonajifok.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/20108859084.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/91972979708.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/82435336966.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/posuwugixa.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/71297406873.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/93458217783.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/23531688164.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/refuxomugokabogup.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/rezuveludetiranetotivaz.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/83241919279.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/zaxolexuxofala.pdfIn PDF document text
    • https://biomisszio.hu/tmp/30274357019.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/pozotifudakidu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/ruvex.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109151622407143.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/9598306211.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/51505313770.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b66247624ecf7df4c2e143ea1ab64fa4/pokabazimepawo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7b069089cf474e33455f6ca4072a1e3b/9750192955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=switching+contacts+from+iphone+to+androidPDF 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_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 16772 bytes
SHA-256: 748eb5864178d72a33c41bd34e2ad7c8d150c17289285b8ababaa5858277c957
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 11180 bytes
SHA-256: 9a9661de874fb0a3900b92671bef534fb74ae59b27a06d1baadfcec1e71c3a8c

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