Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed3e49876268c48…

MALICIOUS

PDF

86.8 KB Created: 2021-07-22 07:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b93baa68207c35013c3107b706bcb181 SHA-1: e794bd0152704a9a2f2b71f6f7929375cda39254 SHA-256: 1ed3e49876268c48ed13eeeb9b127bd49cc1dc21519228d497d8629003f6a306
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/34787880724.pdf In PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/12563423178.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/10114646578.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/mixasugujuwufe.pdfIn PDF document text
    • https://stopserv.ru/files/file/sadarabijik.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/wuworuxizuwopijexejanizo.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/16880096903.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ed35d88287a---vorejenogetakunitebepag.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8fb6ed63e211f7c2afd30689352515f1/15637164264.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccceda3842---35604581110.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43e4c3d32d946ac5bc14fb8d1936639a/62483256062.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160755bee11d5b---mevutofoxotatulofun.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/hbjpc4optt38ldpg65ld4bn40h/nerilidasurosiviwubife.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/6913854733.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/80670390812.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/81224977469.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/lmb0qe0msq70n9sciqde2i0ut7/37018276479.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608299ccab82d---1333839088.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/80063171651.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/55001576535.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/92181733131.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/83418701469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=live+tv+net+apk+download+for+androidPDF 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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 10524 bytes
SHA-256: 6d27d0cc71f29c9862a5c3ba30f281d64291f25059e56154f26c032cd2ec143a
font_02_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 17516 bytes
SHA-256: 2d7c998a7851c25462b23de35ae93c23fbf602137348bca78623665a9e63302f

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