Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4f3eb69a07bed1…

MALICIOUS

PDF

171.0 KB Created: 2021-06-27 10:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 75fc0e4297f2489c545fa9a1f07344ac SHA-1: 73710e38b6f52144bf55b10560602d715f6f22e2 SHA-256: 0b4f3eb69a07bed1c3679b64a32fa15b838b24b16a988b1057a29e6502352042
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress uploads, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9220

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 http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5b2572c95---mulafuwirufanugibe.pdf In PDF document text
    • http://swiss-ex.com/kijumitajabewami.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/pufuvefuvilirinuxataku.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8625dabf15---punobutokawibupoxuj.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1c46c04a8---4739281872.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/44ec2ed12eb13cd310c71b84e51730ff/nivazikaju.pdfIn PDF document text
    • http://airsoft1.ro/files/file/luturu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5983800130248031c6accaad5aff1322/naseralasobaf.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f9799bbfe---60854468698.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bddf4ea1010---57880698412.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c8022b0f61495139a48ece9d67e19253/konorewu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608b822c85351---nakevomoxuvaluravov.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/17541073507.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25e7518e5---xifodedebezefixodadux.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/kugolafadomewubiro.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/965b9a09d649ba4db92697ba4a7101d9/3795175034.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jiminowelagataxewe.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3beffd1346052f9bff224e4382927038/90759641744.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/39619879450.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/13199591804.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c5ce070dd251aa177b8cd7ee73eca24/dizakobadedobu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/rejezufatufanipew.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae069ae6cbf---76037346447.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/37360775506.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/60442380227.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/juvewaravu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=might+take+a+whilePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 130728 bytes
SHA-256: 424f554ef7d385f228960541fb0cf34702445010538726ec724b12349e1e8b9e
font_02_sfnt_off00025b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B55 10068 bytes
SHA-256: 72f299bd2224c7418fe21eba7c5ba3fa18a0a585dacb14d891a105830eb1258f
font_03_sfnt_off000271e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x271E7 16356 bytes
SHA-256: cf67b01686b8bcd0630f4f33b04e2ae2fd1450a0057213cd6ab46e4159f86e64

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