Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea584a3c7f1aea6…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 13:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd7ac1ea9a7f4dd722355b65abff079a SHA-1: c0c5bb745565d4c7bbefb02494de9e4eb7031dfa SHA-256: 5ea584a3c7f1aea603320adadebd17231aad3b327f73bd13d827abcb47b9c76e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to various disposable hosting sites, likely intended to obscure the true destination of malicious payloads. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading an archive, possibly by providing a password to decrypt it, thereby bypassing gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=theoretical+mechanics+by+spiegel+pdf PDF link annotation
    • http://uktohabbarijamalta.com/files/file/52622757148.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bae00cc38---92959774095.pdfIn PDF document text
    • https://kiptep.ru/file/lirewir.pdfIn PDF document text
    • https://linardi.ru/files/file/81593897507.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/86921688363.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612effd1b1527---98373870379.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/mefufirerujule.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d0c89545a26d1ba1b872d920845adf78/49618576738.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/56344781051.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/23905350780.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb5b82686---toruvoxabudataxoda.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392f0aa1586---namubodotuvenekiruxom.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/suxagunazasex.pdfIn PDF document text
    • http://7profi.net/userfiles/file/posaw.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/gawutedixevepaminuke.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/51597145397.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/kikorejamawokigozipoj.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/rivijivavupodi.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/zidiloselevurub.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/xelew.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/xoxamelolanexamarepimumin.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/74290424603.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/64148036111.pdfIn PDF document text
    • https://sergiomauri.com/images/file/7719401575.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/48406106183.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_off0000c5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B8 11284 bytes
SHA-256: 6052b64f4e1131c3823f972a0e6cdc6b076b1a64f00f198cb6ed5a1d4cada69f
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 16880 bytes
SHA-256: e3e04fef9dbd70c228c02ff985d6c8e74fb398aef75f56741d67bf97c44b2fdb
font_02_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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