Malicious PDF — malware analysis report

Static analysis result for SHA-256 109a46485f890961…

MALICIOUS

PDF

75.2 KB Created: 2021-08-15 13:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4bc27ea7a1d12f834ae65f282bc17f0c SHA-1: bf7055b41ed6fd291940b624b052a03e91907c8b SHA-256: 109a46485f8909611a36e612678c9237a3a2fa27b501a2cc9819cb848868d03d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=libro+de+segundo+grado+de+secundaria+contestado+espa%C3%B1ol PDF link annotation
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160935e0d0ccec---namejitexibupixaforuku.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210612_1171081416447035.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/9898311382.pdfIn PDF document text
    • http://accronline.com/userfiles/file/nigomobipakilovexuzozo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf898aa669---82583075929.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/26960798476.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/29227435315.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/kisigade.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d04c9316a8b670c1fe6be6988ac3d2b1/13790987529.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9601b4c67f---77646817107.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f7795c0b---fabukegalunelewuroranogo.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/wujowenudimerajo.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/96043071176.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/5c0fce1923d533e5476cadf8dd376d64/motuxumi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4itqtio4lsrt4fsft43oim9kp9/77380928101.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210630100137.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/976366716fe2c7ae186052a875bb4fef/lazuvojinafora.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7b0eea42317a7f89f371b1abe43bd458/bosexipe.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/bidokesoverodusokejofixi.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/423111c717e4a183b2fcd4607482a9ff/76308976083.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/18272527604.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/wanipofetotar.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 16568 bytes
SHA-256: 88621b43bc7a28adfc11e38f233a7eb4efc4f6014ce0a5f280020a51f24d9ace
font_02_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 11092 bytes
SHA-256: 421bbf7193d1f2748a388a9a7e7cf4d507192f07b7c415b40b29e1760f28c2a7

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