Malicious PDF — malware analysis report

Static analysis result for SHA-256 e055620a586fcae4…

MALICIOUS

PDF

72.6 KB Created: 2021-09-14 04:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ff0968e486742654a15c937d13c1593 SHA-1: 370ef62e17048d28cce461977a17ac3605eb3915 SHA-256: e055620a586fcae4593a46e6775e2e3051a11c7de43d2118f2d607c45a3048e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=happy+birthday+shayari PDF link annotation
    • http://letnipohar.cz/upload/file/3477334595.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/32177541086.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd59392997---68063985902.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b4a5ac94a1781ea579208a284c574ba6/35035051989.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/88077333262.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/79567380061.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/15065694852.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/17598034441.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/waxopilirovanamu.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/zififasimezuroga.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/pejapukopazijusavujoz.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/58524694749.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/texefofapefapapoxiwepuve.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/61012848836.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l81lh7tnhghi2r0r6k4v1fkmk1/66055284340.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/miwavamakuludivuzakeb.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/rogatuvij.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210913_1741A951660BC88C.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/ketugupebajusowe.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/58847023752.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/vesipaxiradukuxokezeperav.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8befee94c789a3404d50a704bf44be67/tixiligazagewure.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/928dfbab892fdf7f91a77f8797064dca/kezasufumezum.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///bexusoguditeti.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/mulaf.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b6a8d917---juvixawimuguberami.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/pabejadezagudemuduw.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_off0000b997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 16960 bytes
SHA-256: f8f76ecef6fd630bd5781c4fe99e681584cd15aeb54cbcfa0767863af5a474e7
font_02_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 10332 bytes
SHA-256: 4811557c15919a9b965f4ede0a761486c41367ca6437760cdb37b39af81c53dd

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