Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2591e9dad05da33…

MALICIOUS

PDF

87.8 KB Created: 2021-08-16 00:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf21319b8bb7d655e71501133f338db3 SHA-1: efd3d24553159dc89d7530fa46a4f84c972f6d94 SHA-256: e2591e9dad05da33aaa7fb53970a0bb7ec1c08d1e64b9090949867f091c0e01a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of external links strongly suggest it is used as a lure, likely for phishing or to download further malicious content.

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://garglob.ru/uplcv?utm_term=john+rawls+o+liberalismo+politico+pdf PDF link annotation
    • http://rosniyom.com/userfiles/files/gebakinobesetowej.pdfIn PDF document text
    • http://starringthestricklers.com/clients/2/2b/2b6f34f03d9ccbd43d04a050b3ab825e/File/85744165380.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/2503703403.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/563209112.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071342c60c19---84705720742.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105020107539595.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/92593325264.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160753a782a6cd---40345829303.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/52960677085.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/76512394479.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/88397733483.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/wiwikituvowe.pdfIn PDF document text
    • http://asztromiskolc.hu/ckfinder/userfiles/files/juvininegemizabegi.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/40647239897.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/premd42mmj8eakh2ko1nbhrth3/xubuxovufig.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xinerowewogivunam.pdfIn PDF document text
    • https://virker-ikke.dk/files/57505422511.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609488143852e---soramalotex.pdfIn PDF document text
    • http://clarasonic.com/upload/file/16064389809.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/63192482148.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6621b35d973455c9a8ae1f4da4bc0874/97631992708.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/garuwovekuxisobimojorez.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d48bd1f4c4---wewuniv.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_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 17712 bytes
SHA-256: 6c970cd1c13716d02ec90d8bc15e85c34c5a79bb48d3e598bac95168002bc51f
font_01_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E3 11104 bytes
SHA-256: 012a2d1b27f66031e292eb4afbc962bb33fb7bffe9aa62753a41165617af7888

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