Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d03d5f0131ab75…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 19:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2791c8e4e737eb9512d48f1b559c0ac SHA-1: c26610143f5d00771fa530d30611fd1aa39a3597 SHA-256: f1d03d5f0131ab75a244dfe766a106e5097f2c0f0ded945bb3ad99a3ec1cd103
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=tratamiento+fisioterapeutico+para+fractura+de+tobillo+pdf PDF link annotation
    • https://gulf-rope.com/images/bulk_images/files/10960629885.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/uenagf42u9d72807k2t1irobtq/benewigogavaxapaziwati.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a762567ba94---85843864889.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/21323909219.pdfIn PDF document text
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/77345827334.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0262231ffbd7ae615aefcd4e63d21436/17544359291.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed783a02345---geratasisiligatuvol.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/suxofedamizavozom.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdf784f27---53019240395.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/79c856a730291d7eb670af3a0e6dd5cc/timusanaxo.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/20197114378.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/36grgnp72u5tpfra67thbrvti7/97133561398.pdfIn PDF document text
    • http://armanetti.com/images/78635918678.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/gumoxogemegunovexu.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/lotemesep.pdfPDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3d5f9d85f---sidajebukov.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2966b9cf05a106ef84455b9269292a7c/31685648090.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/11795739391.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/33oq0ld299e7oqsgvmgk6en7t6/16381551581.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gejerad.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/divufusoxizadekotinar.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f003a8f9c8---tegofugoxiwog.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/73182852058.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/biwafemelenakudaf.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/fajufovebumeti.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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 17896 bytes
SHA-256: 9aa9c4e069953cee013a8bcc240696be66b67763c72712b67a4e1adeb1b49ed2
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 10984 bytes
SHA-256: 882376415e6cc587ff90643f861d9be4c8cc1903d8914497782882c12bc90897
font_02_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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