Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91a4f4d04302b27…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 12:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 52859f96b18bc2b005efbaa9dc2c353c SHA-1: ce717291252724d0bf90f1f8b5563489ea844407 SHA-256: e91a4f4d04302b27771a65044e57b27e06a1f2fad3dceacd1eccf8d861565ef8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=29+week+baby+size PDF link annotation
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/13632557960.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e3207b4413400c57fa970107e7d2b2a7/kevari.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/lsfq7026adot4odtorqqjpjgmr/wejotugezitezavubojixo.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/38536010362.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0gvsqe6h5kg4riemp17hbuvle0/81774602176.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/ranuwidexezametesurubuzo.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/jekim.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b3041c796822a3201f7af0444b87e40f/dulonitewesisixa.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160852e813ed35---sosekasawu.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210719110131.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/mumugu.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/95693415770.pdfIn PDF document text
    • http://npas.ru/pic/file/32957698886.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98db64ed8---9849138477.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/959542cfbfeb8084914c10763df83cc9/jeruxupilejafaxuxus.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1be0a11e58---wifetivuvi.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/kotenafomaraxep.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vttffseckajr938h1jpj47sm4o/vutoposofiloku.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/dutegoxonomadapirudamijix.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/bitapigilodi.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/vuxasuzunoxexa.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/solexugigib.pdfIn PDF document text
    • http://it-hair.com/userfiles/fonitabezovavuxofususi.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/bapivufor.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_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 10316 bytes
SHA-256: ca335ed1ee2a39dd91db69b935e15bd6e88910cb391006e15598ffb04bcc9e8c
font_02_sfnt_off00011689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11689 17724 bytes
SHA-256: c6938cc9116abcacea5b686cadb2e37d138a09ad24c76454b66f514fe415104e

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