Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fa4f9cf2f4165a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 22:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a0eb5985a18eef07891edb2492035329 SHA-1: 14d1c69c466573141ba4eb60c464921db012a96b SHA-256: c7fa4f9cf2f4165ab696fe43c5bf2b3e1ad6e9bf54eddc871a34c929297cb542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=pdf+picture+to+text+adobe+acrobat PDF link annotation
    • http://sobateracota.ro/mm/file/17474533280.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/zumarozobuwadoxazupezigip.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/68076250470.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609473a76148a---kopez.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a80229411---ponas.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/kotakajakaxisovijuvob.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/worakamoduke.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080317b2efd8---36814544897.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a03064130---kakevefilegivuruvevemid.pdfIn PDF document text
    • http://elijasprojekts.lvfiles/file/82122422399.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/8d8fa0539a06cc3dbae02163ec5dee42/refeniduxizijelam.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/49440545081.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/35929213020.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa190eb81b6---10933519046.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/jinc4nf0bqj5qjrm1g8b44jlq9/60707646976.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b94dd617b9---98907675680.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/72239573538.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/88150595889.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/turudelivufiwomaxisa.pdfIn PDF document text
    • http://amandamaitland.com/images/file/tapevowaduse.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/3952950602.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f074a870218---mepurawanejofimesafaw.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/naledapuwewizofujofu.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/niwetiritaforag.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/50767312264.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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 17740 bytes
SHA-256: 8be9399d3a2d08cb5dc745c37cc0406e0fe300ade3dabcf7a9f4010c7491e07f
font_01_sfnt_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 10640 bytes
SHA-256: db20c2d074e7b6e4e885dc55c2981c7111783402802e0a2467d108dae39dbe2e
font_02_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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