Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cc8f80bf2179c2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 23:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6da8df662e73df35099c91cb4d3c954 SHA-1: 90b1983ad2fc9f6b5bb0ee15aa6b3a6a54ac94ec SHA-256: d4cc8f80bf2179c2e930123c0c5747d83dbeeda26e70ff53bd2eb7ce0debfee6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many of which are identified as part of a link farm pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141e4c282071---77410069121.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b6f7b369997e3f6e1926f00402b7dde6/29030884906.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614144f21d95e---20318826390.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/79526194318.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d226f34d9---jerowopubimuwareneruma.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091611360097.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/91391985883.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/gujojurerutabebefubo.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/dusofuwukagib.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970d2974bc---86827789813.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/86835647228.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/norazavafokuxobugamugipal.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/23698370137.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/zezonegasozi.pdfIn PDF document text
    • https://ibextrail.com/editor-images/74420046514.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/jegijizunejugefutodi.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/kivovawakibig.pdfIn PDF document text
    • http://newcityhk.com/userfiles/xatudodovotalebiduvogabi.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/79243970066.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/fuvivubapiminiridoli.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/19863119507.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/57745176297.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148475dc9d8d---forotagemifufepukadosuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=call+lock+screen+androidPDF 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_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 10388 bytes
SHA-256: 7510a47a33a5d029adddb2f0f436fdecb8d514e80d6e4ae584763f52c3d4e06b
font_02_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 18296 bytes
SHA-256: 94d58f82b4a0ce1da27a08fc4ad39c8a050a042d9a1200b0bc4551a2210558a2

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