Malicious PDF — malware analysis report

Static analysis result for SHA-256 a739b0767cf17504…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 23:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da2370269f7679735c887ca86d756816 SHA-1: 8a1032ebfa59d33aa42b35f2856a8f361c1f399f SHA-256: a739b0767cf1750445cb720c05d2c40fed2d1679f6c0bf8c7cb97c58d2987f90
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://crewmak.ru/uplcv?utm_term=fifty+shades+of+grey+telegram+download PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a8b43aa5---zisafexemibenu.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/tefolatabigerukodi.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/46804535943.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ab397900---tulitivup.pdfIn PDF document text
    • http://www.pvvc.cz/files/26400360805.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/filabugojiripuguwus.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/kigagixobaju.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/sazibokirovu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819d43ae8f---49624929254.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ke358vj5fdgs78nq8mkb1tl5rn/13275471053.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191214799518.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6dbd1f7a5---dojofewutesafejuje.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a83d6bda---4566243160.pdfIn PDF document text
    • http://fluorescent-training.com/file/13593687101.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/fuvokubovuxaba.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/jogujenakolivafujabuzufu.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86717347210.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109060834425190.pdfIn PDF document text
    • http://sinoorchids.com/image/file/zokek.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210904080440.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/jezeva.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/dojejomufawivelebi.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/kaxegoridunekemanozibap.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/3841854855.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/58544953089.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/jutetisajuvifa.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_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 10976 bytes
SHA-256: 5e57fa5294aeaf16fedba534e1a39f8df4da474ac881620fdc53e4267ce6bd04
font_01_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 18756 bytes
SHA-256: e01594bd1c4795d9023aa3f75d61f936af077c240022184ca55e69c464f64bdb
font_02_sfnt_off00013b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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