Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd984cb8ec4e89a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 07:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 001f9826502f3a81137e2be73627164f SHA-1: 9d1c73cc8dc0ededfed91e2f668d89f06ea41148 SHA-256: dbd984cb8ec4e89adced7a18d10b3ab81ef326b61c6c857883721df81362a459
164 Risk Score

Malware Insights

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

The file is identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dobraukraina.org/sites/all/sites/dobraukraina.org/files/kefaxodajobiwefeguzemo.pdf In PDF document text
    • http://www.bongbansaigon.com/uploads/files/punewavikenirinuwel.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/95465833368.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/vupijesolow.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/16697342859.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/vupiwenajaparivusewevuli.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136c46a27f06---zilulidijevomodom.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/zojokitaninofofidana.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/siziridunafuwezoxizug.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/xekesaziwilivenut.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/34039569094.pdfIn PDF document text
    • http://belst.by/upload/file/xuvazeforivemubumakov.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2aa91fbb888cfdf07fc8f3a097c90aa7/tisolabilekinepivuxufi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/440a59d0b03ace9312efda769ee67936/5104571873.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/071915502368.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/zopazirapubus.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb779933a3---63043149934.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/55178968783.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/48990324126.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140e60bbde6e---78172589572.pdfIn PDF document text
    • https://samudra99.com/contents/files/84360431896.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/57562834683.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/48920610316.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/848a938c645c7168ceea99781e0897d4/84846091558.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210903_0AE399203092F42E.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/13263298548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+windows+7+free+without+product+keyPDF 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_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 17052 bytes
SHA-256: aec773faddb154228086492fe4997ac8ddf32894f34347feaccb2034c8a8b901
font_01_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 11160 bytes
SHA-256: 59a1984c575018db36d36de6119d21b608538e849bd14078a820bb1af2acc47b
font_02_sfnt_off00012690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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