Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dc23b60fb20596…

MALICIOUS

PDF

85.4 KB Created: 2021-08-10 19:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b9f6160e892622c8d7ce536c31acde00 SHA-1: a998f60027b8ee4700be1c4fb48da23ed0e42bd9 SHA-256: d5dc23b60fb205965384689a3a8e0f92533c7854ab97b6cf7d812aae910fcbdb
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of numerous distinct hosts and UTM parameters suggests an attempt to obscure the true origin and purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16085878a068f5---2488374905.pdf In PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/aa3c374b5ddf43f493901431e9bb1bca/giladiruro.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/u82i24sen0a1agn6gempto5sjr/sarabowowoxosawosoraj.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/27294516119.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/zakazadokev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c261485457b---litiposadejarawomazeze.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ae41dac214f298ab7ea1c1f07322420/kuvolelewigafarojefo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/6920906332.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089f04720a6a---80824282383.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/35427898221.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/177b49fafa32a7f03286dc6298e5a542/43060464929.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/41314547212.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e2625cdd2c4dbb7b9fcaf337962690df/zolamerow.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66c9aef27---69951508703.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/juduwovewotasogo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd918284ba---19662061904.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9d4a0c224a7e82e9e18db893c873f079/xeliwupepub.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2ff899f1408c920bcdf190842b03a3d1/sadazibodejuxarige.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/xibed.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f10618c596211d1d1f27d73b6d6b0c79/zupejagajujaperirazitalu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa4dfcb40e---85325239289.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3ec31011d---puwunifuwarelusurixupuveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=frontline+commando+old+version+mod+apk+downloadPDF 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_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 16628 bytes
SHA-256: f619ef1531c98992a1fed95ffd88faa7525943f7c3a6c334587357d7e4fb60fc
font_01_sfnt_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 10896 bytes
SHA-256: 31411290489299ba12a19aed41750cc418f7adff9af3ae4005d0693c2e2f341d
font_02_sfnt_off00012fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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