Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed1b246ad7230ef…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 04:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14e3465ea37681cd5cdff0987209a24b SHA-1: 536422b2ecd00d70dcd7c581242a86e340d1a80e SHA-256: 2ed1b246ad7230efd662782b106e097dd8ef2fb35350f96674ca0c6ffad9700c
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of multiple PDF links on disposable hosting and the use of UTM parameters indicate a deliberate effort to lure users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hyundaiokla.com/uploads/files/84525889098.pdf In PDF document text
    • http://valdhans.cz/userfiles/file/39146308803.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/masebaduw.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/68440658555.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/tunabanazogekopiv.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed88e6d5a9---javadegoxopukadekufavu.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/zomuzuxevup.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/51041091387.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/mexevaju.pdfIn PDF document text
    • https://lecachet.fr/docs/files/sasuxurewozomanob.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/bujegodipepugopu.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/xedeti.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/gamejis.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/73502897653.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/80333210333.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/foraresizividujigalazal.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5bca7923---27065450959.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/pukedukebopiwalige.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161363f426c3a3---19389634909.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/satofujopanarugiwuzu.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/doxidiraxizixikesax.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e946acfdd---37624937270.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/78845492833.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/22036863004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+icon+changer+apkPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/85274960671.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_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 10704 bytes
SHA-256: 322d33744d4c207fddbcdd8732865e9d7d588027303a22446c03a2ff38952084
font_02_sfnt_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 18720 bytes
SHA-256: 0358b3085af9345c03e53759df11273e190388d5ae7c6bc19ed6dee040200e30