Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8a023c44598280…

MALICIOUS

PDF

96.5 KB Created: 2021-07-25 05:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77a2dbc7cb1682f8264ad88feceafdd4 SHA-1: 62e0e6f968d0666d0a054da66bcd40b492d90897 SHA-256: 7d8a023c445982800e604915c6956ffc95f377b7c23fdd2fdafb9c232eb4e226
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. The heuristic firings indicate a link farm strategy, with multiple URLs hosted on disposable or compromised domains, suggesting an attempt to evade detection and distribute malware. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f8f5571edac9eee231aa1b45071c1d2c/rimokegarinololukonasusob.pdf In PDF document text
    • https://kovosluzba-praha.cz/res/file/rufojule.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/551b75b1f2fbc750b0e0e0e4a2ec769c/liditusotelonatu.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160927fb35d273---73294521724.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/70984671008.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/dulikifi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608358114ce28---6081352640.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/govotizidag.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/domaseden.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6e27460ddc2d8378dd7433ff3263261a/91353071829.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/rivedumegutemokigo.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/tusik.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6b3v2k8q6ga6e04h91i1lgu0h4/gukiposivoweboxovilo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b113bfdc6---batezuse.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e96dc4ad5bc---rerotolasowibavokiv.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/9218528212.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/caec80d6c421a92534d37b5e10def263/ladilubigazimatudesizef.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69a434d4c---65309543945.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8b646a0bac18e7ad364a482483ea4740/kilidowugijavasovepogijim.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/pokap.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/rimixibeselugofer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=area+perimetro+y+volumen+de+figuras+geometricas+ejemplosPDF 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_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 21128 bytes
SHA-256: 8483b1ee660153c012243ef29942c7b2771692717a96b0d5ccfdac6dff60b780
font_01_sfnt_off00013f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001579f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579F 11356 bytes
SHA-256: 4904bab0d031033e6d5c1849094112d14421dd8a047d42979d2eebcceac1e59c

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