Malicious PDF — malware analysis report

Static analysis result for SHA-256 184344f17914c33b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 21:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1a6f7e9eda79129d9d07ba900f71873 SHA-1: 03456a4147ba12f48aa105319845e322b3c46abc SHA-256: 184344f17914c33bfa836ac735e9d08b64ae89f626af3f6b4d245f93972eee46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This 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 WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=hydraulic+press+manual+pdf PDF link annotation
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a823163f8---vezijas.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/fufokobifenukarurifixisax.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/88377180116.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161237f721183b---takagasune.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608882c10e9d7---24580861948.pdfIn PDF document text
    • https://area5srl.it/file/37020155434.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/lenewapotemuwonen.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/94863850087.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/zonufiromawavegoduzeso.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070de322462b---47357894454.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1cb021e09---58902948021.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/be1f86caf2ac4f286c49fe3b82b3c4a3/sapiwumepi.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210824_246AA2966ADCD409.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a1ca28aa---44133366124.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/xafelosasovexivu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976080f1021---27271209841.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea5176ca5---fovuzud.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/83071263622.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/siwadudejajawivigok.pdfIn PDF document text
    • http://packturf.fr/files/17809532929.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/gozitisovimezogeriw.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3e7c6016---zuzivemafidulobamuriwiki.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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 10768 bytes
SHA-256: 8895ae7ca8189ece9434ab629f3a466f3bb7e19ddf105f87375f3038c5b726e5
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 17448 bytes
SHA-256: 064cee653ba9bc74342e8970bbcb1a7d3a0b7f56d10bdbaa6208dd01d6b1e7c5
font_02_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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