Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dc08fec461b7aa…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 15:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1eabaa21e70a708a15bca9760e0f3ecd SHA-1: 0a9991fb5e8b5c5ffaaf19f08755ee7d6ce708ad SHA-256: 54dc08fec461b7aa6676844503d82c1f975a7c1d17cf433ab833bf84c1bb8a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rockeit.com/userfiles/file/woxikuvepojulomegef.pdf In PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/vasokerenukasujaganexuz.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/nopesimimebufufodizuna.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b5e742469c14cb3addc0926d4b102442/39378542746.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/ridowemejagipafomofobelok.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/59806663938.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb37609e7.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/65378340056.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/67053867646.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/89021334434.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109030628003089.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/39431794419.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/xekigexiruw.pdfIn PDF document text
    • https://phm.vn/upload/files/31338137671.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161344c21b4146---37944179364.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613799b61f977.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3568a59e---fujesirofamugenemiv.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/niguxivupoxotidunob.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/81996108565.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/mesugisogesatasupojak.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/25277440805.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/62473270295.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/noxawejifamuwijuwoganal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fun+blocked+gamesPDF 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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 18352 bytes
SHA-256: 8562d03b9ff0616c15ce5ed72c5dba017caa17911f969dbdf97eaf42c4644136
font_02_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 10732 bytes
SHA-256: 666abf48faee3ff4c2321dd44667b9c45a392cb2cc6a44a6fa314c29a98668e6