Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d883fd70c9a7a7b…

MALICIOUS

PDF

105.8 KB Created: 2021-06-26 05:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 27f43cd0099c699821dc5387d52be0c9 SHA-1: 292379456fa25a0b5a205bbe4a10c72b2be0948b SHA-256: 4d883fd70c9a7a7ba4b97e9170949212e7271c2346793a722e74c11e5dcab3c5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. These links likely serve as a distribution mechanism for further malicious content, such as phishing pages or additional malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://crewmak.ru/uplcv?utm_term=taxable+amount+meaning PDF link annotation
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/493d287fb1a4cffddb7eb1fd831ca75f/nizixivo.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/desibedemezokiju.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160820e842a06c---91203210040.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/7luh3gd6a1cjeogsv763ei043k/bikewala.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/mtieqqcksgkj4bkj2k6fohrmf7/18197095572.pdfIn PDF document text
    • https://datawire.gr/files/files/1640920700.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/705c9d7799d154c086d0aaf9e55ab44d/86390750510.pdfIn PDF document text
    • https://slide-bearing.com/d/files/pesuximaxejusozajalororoz.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ouc1km4ql67bt8s4f1vsh23lp3/99337561932.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/lerojejesijezevid.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d0ebb7dcf4---rewexanodigojusevado.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebabc4bb0a---ligebojegemawu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d41523952---kapefune.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/i8ok1c68edep493kcgdo68kj5s/josesegakaniduzunujituz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0946dbcf3f---64024081717.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/li5nhdgvv85nmpoo13s944kmbc/tujetugaladurugijimaket.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/6eqmcrm01a84bi3lfljtdc0lkg/70669070633.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/12920862805.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/eb5f5238ae9237cfc4ec1815f3bacbbd/10748933717.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3c30cea1---wabut.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/7eaed08ed21b1f5655cdc377965fc4c8/79858632649.pdfIn PDF document text
    • http://digifast.cz/userfiles/rupapos.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e49a317e1e7ea798837612b7dcbb834b/5099736205.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qvs64neki6rksglqjpk14lupps/43442414521.pdfIn PDF document text
    • http://cy2hand.com/userfiles/16738671439.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/noralegaxuwubat.pdfIn PDF document text
    • https://wecareprogram.org/images/file/goxonikosalomaz.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AD 18128 bytes
SHA-256: e442ef7694f1d00264e908b15492537a1bc5a26ba87fada0ed4420049b40cd05
font_01_sfnt_off000169c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C9 10488 bytes
SHA-256: 4f6c0c2384cef0dd3bb02e7455ee06f80ed6350161b9d9471684113d28de3f8a
font_02_sfnt_off0001819f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1819F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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