Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1af2ce96f22bbb9…

MALICIOUS

PDF

73.1 KB Created: 2021-09-26 22:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4b90a4ad4585e9b058a6915be62e84b SHA-1: 54a490af49840fecff29fb0d1fdd66c513d19f71 SHA-256: a1af2ce96f22bbb900352fc0b287497dc54cde3a1cb5ea2fc1c73d17b7eada46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=doc+rtf+to+pdf+converter PDF link annotation
    • https://franciscovalles.comtraining.cl/userfiles/files/88120485044.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/vozodilokilowifukibiwini.pdfIn PDF document text
    • http://www.programasaudetotal.com/arquivos/file/62198638067.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210907011128.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/11142884348.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/73541618564.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/melojivateti.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/kovadabunobosel.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149a51094cd9---26145223081.pdfIn PDF document text
    • http://idroter.org/userfiles/files/vazeke.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136497154713---luxonewitinogater.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f096bc76c0---86105972278.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/xebufoxezovuxajokawa.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/5999647066.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2be8ae746---92945711673.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/13882386575.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/zuwunumosegamerejipipalog.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/sapasipatipupupesaxuw.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xinuvivewiguz.pdfIn PDF document text
    • http://delve-cr.com/uploads/89745366310.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/wujekinubogelusi.pdfIn PDF document text
    • http://greenbrier101.com/userimages/35837445441.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/savoxunutisiguka.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/likikumumoxoj.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
stream_005_off0000ffd1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFD1 10212 bytes
SHA-256: 5baabea4e629d2c01838ee73e9e1b097eb49913a42d72becdec60f5b27987b41
font_00_sfnt_off0000b865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB865 18268 bytes
SHA-256: a7b7fbfbd5ef1a3a09ca8031fd7484bc2dab1c167e43a6ffcb21527c0dffdcce
font_01_sfnt_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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