Malicious PDF — malware analysis report

Static analysis result for SHA-256 b476dffe6d95aa02…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 14:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be57277d710e7186a0c80362610d72a9 SHA-1: c46df7f66b9154fb75aebc92e3a2e839987eaf96 SHA-256: b476dffe6d95aa02e95afa12d8adc001ee5c2ae20cfcbc5710f2a6c70bb63824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/poxogopokakivomadope.pdf In PDF document text
    • http://gerocuki.hu/user/file/93865070996.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/dadamanumumulivaxumutet.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f364e7d2eb---11273779222.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41f92c02a---safonosofixoxusekowabup.pdfIn PDF document text
    • http://rjt1.org/upload/files/50289539344.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c21f6881b---wavafiwufewupufan.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/54219980910.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c93acc1519---63549960573.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/zetoraluzuteru.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082475849a08---tamujijatugazuzalizami.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/916757b9fddee6e07ddbb08c25d7934a/bogemune.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/17244257291.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/56577684304.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/femikuwebuluduzosil.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608042f7dd1c8---49889805842.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/122fea658a4b0f2661d5f0ce84dd35c4/50981772523.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/841489eb981286666c55af917a94af29/jopix.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/37505239581.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806e0f114dd---24442223071.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9e323157---42823439583.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1j4e9gd9hh49ti1ga260kcg7h1/danuravulosuriwimisi.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/55904326304.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/2964560501.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/33305764734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=watson+marlow+620s+user+manualPDF 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_off0000c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 19756 bytes
SHA-256: c5051a4771a99be54947f7ddab4e5f782f6bb8f2a0f5ba0ee50bd657fcc4a9e6
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 10764 bytes
SHA-256: 51b68b16dc29ace2a5557c9fd3efc5f9d291f9abfb6923276a3a81f31edfaad7
font_02_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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