Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c6f54e82176f98…

MALICIOUS

PDF

93.7 KB Created: 2021-09-03 15:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f38216310cac0dd1816e5a16b219943 SHA-1: 3d82c350c4a14cedfd0faa32c012c72da3b7dc63 SHA-256: 25c6f54e82176f98e6b47a88dd3871c7f352e21b6573e3e861f523326d6aaf54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or use disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and embedded URLs point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/53661fd0a5e1ed59a0ac46cd5da3d4a4/gunupavaladirelu.pdf In PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/14191982983.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/xavazevaboxupurabubip.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/gexotemafutasek.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1e66aa1a13830b2c01c0b5e71b766e65/zafitetokagovovisobowu.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/relevifigidinadopikitano.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/lasunup.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/gopidijitifo.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02443bffa---parabomuvuganeda.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qfr9sqjth751cj8aiagqgu9olm/16507104844.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9a870773---badazawadalovavebaremuv.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/840810837.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/85930257081.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/3b5dc80874f1e93db84155cbbe3d8256/84299717581.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bb9e973ce---81833612444.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/beregafuxebilavotubogiket.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d79e4e264---pomeputupuzefer.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/47250626842.pdfIn PDF document text
    • http://zxsolar.com/d/files/bilolomalipi.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/juvezebiwidajeg.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9pu10n1ft4b3cd17gkvh2d8ad5/46217053724.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/3170c189f5f30e1251b0dc3d54de1e21/mogepon.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/93868916299.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0082a71de5---78342721630.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/edb047ddd14f015a4dac6f98dc31eacd/fojinazojafuxudutoga.pdfIn PDF document text
    • http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/sivawiwulemuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=aquelarre+pdf+descargarPDF 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_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 10608 bytes
SHA-256: 575b73aeec65516047d2de7ded2fa5452aadc931aa130fa5f04df6e5dd275184
font_01_sfnt_off00011bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDD 20756 bytes
SHA-256: 3b27996fd3f89164016a1817d54dfa558d8395ce64d5bf035a9a099241530930
font_02_sfnt_off000150e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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