Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cbc66a2c90ac2e…

MALICIOUS

PDF

73.9 KB Created: 2021-06-09 23:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52e90ed80b02d78a20fc92f0a86c1e68 SHA-1: 0c5dad613769fb4a8b68c7afb092fa518b8684ec SHA-256: a3cbc66a2c90ac2e762adaaeeeb5bf8be3342caa556ecff5392ed79636838e6e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as a malicious phishing and advance-fee scam lure. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the document's structure and embedded URLs suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://philabc.ru/uplcv?utm_term=best+internet+radio+stations
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97bed2fdb---jenezovabarovegokodevije.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/hi08almlrubb392sq2s8lba9rq/rofejisuredogagubebux.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d0eb459f---bemijifomabu.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46265d1b01---rotanovuzozaxulebir.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608240785d5c3---95943094542.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/92b78b9a2146daafb0327b7971e774d6/67287703536.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/987658e5d050d447eab7d56a528b38ed/33752440357.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/olgnmtke0j6f0ste6mokeu8rj7/jozezamakawajinukegakorub.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608efb4bd6116---lujusoliti.pdf
    • http://bendhorseride.com/userfiles/file/2062755972.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/29656105654.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5e6a235237f091d952ef814cd4900b2d/nudafezuxejijiditug.pdf
    • https://accuratesearch.com/userfiles/file/lepolurinepanaw.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/855f9ce66ef10d86a57e5845e3b3b6a9/miretatumosozesorowena.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24fe982d3---24559257813.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a75e889f3e---31060470997.pdf
    • http://cartonwrappingmachine.com/userfiles/file/86824146381.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e36e.bin
89a78e1887d82a09bbcfd93e8ddc07ac23523f8f4c99d2fdd60d1613b5efd763
pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 4836 bytes
font_01_sfnt_off0000f3e7.bin
f523914f6ecb41385a138044ba4afcd00bd5abad2264f58bc0c4e22448c4121d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 10892 bytes