Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2379539b36934c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 05:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba76ae0e1f67280cc77600395b8078ab SHA-1: aab5400797dff96bbbde0b8145c5815840a34403 SHA-256: 2b2379539b36934c105a95f8797cc4e7baac392f670be449a7f7914ca532613f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=bloons+td+battles+medallions+hack PDF link annotation
    • http://makassitools.com/userfiles/file///fawafowipisejimimiv.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/ninenetopu.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/pomudadodikan.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/mafafezuwazajibuno.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/39625702565.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210916174518.pdfIn PDF document text
    • http://secoinblock.com/upload/files/58460686715.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/84753228409.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/puwugero.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jedajexesulebafelilixike.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/32300202385.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vbh0i356tuo97mg1bbhv5r8d24/4923124062.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/73611940261.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161392ef1a08e1---tegizekovewutejofijiveref.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/fajisemamevavajem.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/digisaregusetukokajo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613243cece2d1---nijovawaxuje.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/82408190535.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/40078425517.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/32490548720.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a39868770---89238738142.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/wepebeleturoxuzobuwitoxe.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/kavanopexekudalafuwi.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/tupibo.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/tikeraduka.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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 10820 bytes
SHA-256: 36e3024b9960cfdbc9a794c5b61ce96e29f1b70eda5e344c2caba188810dfdc3
font_02_sfnt_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 15064 bytes
SHA-256: 217da9a3d39be5611f24a80b001cd2d36d966ad8dca39347325bebbc4a3ebabd

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