Malicious PDF — malware analysis report

Static analysis result for SHA-256 258af1fbdf253344…

MALICIOUS

PDF

83.8 KB Created: 2021-08-19 11:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bbcdb49df8d5be0dfe632007baf4d678 SHA-1: 63ed46a5bf4e2c7417d1e97408355c78f3a4035c SHA-256: 258af1fbdf253344bcf63cd6c942b1507523755d734581d5f05c4a8c841165ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates malicious actions, such as redirecting the user to external sites or downloading further payloads. The numerous URLs suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=redmi+airdots+s+manual+portugu%C3%AAs+pdf PDF link annotation
    • http://wksx.top/images/userfiles/file/modexuvanolimavikulevorez.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/xijuxekegabera.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/sowuwigopem.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/wisozamagoxi.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1ac3af77d---duzefodola.pdfIn PDF document text
    • http://chingchia.com/uploads/files/202108182156523972.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5a3a7111---89074769899.pdfIn PDF document text
    • http://keacg.com/upload/files/gabadizisexomatuje.pdfIn PDF document text
    • http://fruitvita.com/files/files/96199417141.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/xonamomabazome.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9155e20ae5f0410d9f54c83db02a102/kimuzupetidatudobojuj.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/sinipitoxorixola.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd68056a8d---79448388735.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/fobenetegofukegara.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/40c0f72dab4c207565fa7da9e565e5aa/wijopilowopijaduzela.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/selejofadegoforugexiropu.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/sivizibulufapubopu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9097b4c1dbc0d4fe9a92a7f861a5eff2/janobadipa.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/39df304805705291eaa76bd4dfa650b8/23636389458.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/jurilevuwuwosalujul.pdfIn PDF document text
    • https://maclashoes.it/file/gediginuzinolikusifoli.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/norupipalutonaver.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/texoxironizojelakesixinuv.pdfIn PDF document text
    • http://agavietnam.com/img/files/50634902848.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625457519.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/jutupofujojir.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/513i5ag1gv1mg9j91pej9uv2g0/31709757810.pdfIn PDF document text
    • http://veribase.com/E/file/62244965093.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_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 11144 bytes
SHA-256: 6abebfb1afd525c2136c3fc62f1364e7d79909851de504e9b84add7d7023fe47
font_02_sfnt_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 19172 bytes
SHA-256: 56ce64f785a32b9b56ed6c58ce9006368c51c7680ffdc151ed5b3a43e4015848

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