Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef3fff61d609089…

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 12:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce721b659da7b0720d762a1ab647c707 SHA-1: 495bdcd26aa250bb7d5da27598b1e2c520dcbfbc SHA-256: 1ef3fff61d609089ae685f8a8ff9057701d3b7b5720fec3d906e98b3cd3719ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm or distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4c8aa3b2f02eda0083c9a686e3f28aac/xelamulazujemurotota.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c745fdc067a---77459070089.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/33f8bdb8a814fc669757c6a1f8e42766/38034886838.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160932e0e97549---79311397503.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16078efb8ee775---tavategokawixukuxake.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e05716c5b0ae82f69c277c88e58dc77b/56029124544.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c327b13d8107be439fdbb65b8497e15/74075200267.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b678f7594d0---158821940.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/suxupinif.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e8cfd99313f4e2973c6e508d3fcde64d/62410251747.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160940a343a030---28289852086.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606da1a5bbc38---jawano.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/42394109021.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/dewipibojujedevifovutuxe.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/zudumeboguwufolewumuri.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/lasowixiwaxevefetu.pdfIn PDF document text
    • https://ak-oroslavje.hr/files/tulubem.pdfIn PDF document text
    • https://digireg.cz/upload/wavimagabozebijuwiwexok.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d7f13285e---17337766681.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/66d7a7d2fbbc06e907a80e6a3ae8e3a3/2556489284.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/0lpu43qkdt8rpi41ess52jds2p/60512601821.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/gokodewipulele.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e2017bb4---2488905420.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/84120115337.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ea2f38aa6fbf5dfca41bbc7e45f53942/61375531429.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/58fdc7317ed7cac50e0120ab768c78b0/xoletoriwarida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=could+you+help+me+with+my+homeworkPDF 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_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 10644 bytes
SHA-256: 8edd2fefb877d246ecdba043c86cda7d2a67e942bf7675776bd7a35b127851ec
font_02_sfnt_off000118d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D0 18200 bytes
SHA-256: 0bf1f617ba84855d2111fe5187f747a39f8c6946149746b6b5f24d6e4ff7eca3

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