Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bcea114c3fec61…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 12:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d2f8aeebff2784292641dd9272cb428b SHA-1: f9ac0956b9cdca64da5b424c322a8f85751e806f SHA-256: 33bcea114c3fec619e7db7e203b3257e85a5a221fb9bbf7502181d613dc90be2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown-reputation URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=cliff+movies+apk PDF link annotation
    • http://diennuocdanang.com/uploads/image/files/95000202462.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/16542372246.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/dirofina.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8j1s6oi4ce7af2td3ht8c72vtl/kefapumesup.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/13091017942.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/6cfc9eff091942faaa2dc7978966fe97/vivonopuruxuwuzezuvikuk.pdfIn PDF document text
    • https://kenadong.com/contents/files/napovifo.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/11924381430.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/89687209488.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/mafekosegojuz.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/mosovugulul.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/gaxugaxebasiwifopoz.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/woxisarizoxesigeloku.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613952f2a74a0---70416882137.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/parelowim.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/30943908870.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/jilurorapokebidetoka.pdfIn PDF document text
    • https://doitoutdoorz.com/file/YttpfriNgqh7HEve.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/38821543452.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/suzudutawuk.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/nopuvorarivevidadonarare.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/85599991800.pdfIn PDF document text
    • https://8-hi.dataroom.tw/upload/file/75662474955.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/95369838418.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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 17836 bytes
SHA-256: 6a1913955507e1cd3be37bc2fd022c1e07b80ba22f15cad9469f209025712c2a
font_01_sfnt_off00010819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 10408 bytes
SHA-256: e1e8be92867492cdecc45a5ba839fa8ec889a41d744d4a2a9d96a2b4e66c2b21