Malicious PDF — malware analysis report

Static analysis result for SHA-256 259e7d67a776215d…

MALICIOUS

PDF

90.4 KB Created: 2021-09-16 03:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 981b64c588b817cb5e213d643f77d10f SHA-1: 36ff52c4be27b18d0c2f469bf43737933624efb6 SHA-256: 259e7d67a776215d3af9a66ac53ef4097e6c3d16d80d4fec267cd216be40c1c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9702

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://medvor.ru/uplcv?utm_term=vlc+iptv+android+tv PDF link annotation
    • https://editions-tlp.fr/ckfinder/userfiles/files/gipiwavosexudobolari.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613594b4b5f66---refinesa.pdfIn PDF document text
    • https://bak.vn/upload/files/21588535481.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210911011107_gja0f2.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/86487580603.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/8120536328.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/29596913673.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/fewevatofezun.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/78251838304.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/60491576520.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e7765584045fc195646c23ce5d172605/50491372023.pdfIn PDF document text
    • http://tochuchoinghi.org/files/rikaxigibex.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/jokipoxoz.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/nunasagotinimoxodivomur.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/26156634200.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/desofiginuwiteta.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210911084920.pdfIn PDF document text
    • http://protok.pro/upload/files/piwokafubasemifegi.pdfIn PDF document text
    • http://happy-land.hu/editor_up/wutuxisufidotiviw.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/64947169229.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/67081880108.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/62797021088.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109082259012406.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/metefuga.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130526f92fa4---26345830220.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/28852050955.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 2128 bytes
SHA-256: 57e0292be3dae69396d24eeb93d5f695b45ab015893fb967353d758df89f1456
font_01_sfnt_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 10244 bytes
SHA-256: a443a4425b29148942bd67f2eccd3778ae944405e5a49702e5c4963e8fc71838
font_02_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 24148 bytes
SHA-256: dc0124088c7b1a2b16f4a1a386c15bdfe308c74f365a1613ea8164558677ffb8
font_04_sfnt_off000144a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A9 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59

Open this report in the interactive analyzer, or submit your own file for analysis.