Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2773cfdb95669b0…

MALICIOUS

PDF

87.8 KB Created: 2021-09-22 19:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 560a53c3706f086ed5621e2dee0362c0 SHA-1: 356c3f615a7a1ba736fa3d1b1b6967fa4eb959f7 SHA-256: a2773cfdb95669b0b3d0c6d96c6f720daa4109672fa359c17faf589db8da39fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=lego+star+wars+tcs+android+download PDF link annotation
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75736f175---xewipalesedoseju.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161426d2f952ef---xigebawidik.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8cf743527fafd7eae1dd49e07fb54890/jugulifevib.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/19/83099597632.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/dulilizoropemosi.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/95181562391.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/40460745329.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/zirixe.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f202fb60---buposomukolikobax.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/81523349857.pdfIn PDF document text
    • https://masihpt2.com/contents/files/pifexupi.pdfIn PDF document text
    • http://nineslash.com/user_file/file/popoguwopuvisobibuli.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/61221282835.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/zodupin.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/92094615554.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210918_64DC1B2E5BAB5D62.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/nobubuzetigukoguwazegafi.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/78449174449.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/93564242626.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/52569696117.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/34423325035.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0085e4d0c---nevutipidafutu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16148f31e05fca---raxopedosusu.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090122535173499.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/4724428920.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ge5n3v1uf2sk4pui0qlisodpni/batemudodimusorala.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_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 21412 bytes
SHA-256: f62389ca2d90f7b0d27521a6a77fc41bda7d61920fcccdd415c1540cb1294385
font_02_sfnt_off00013915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13915 10588 bytes
SHA-256: 8b26087b3b6d47566c04368c8f39787b35e5e16eabdc9cbb6509de5255881a09

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