Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3f95a54c53bc8e…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 00:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c3f39b364179dd7a1ba85dff0153154d SHA-1: 2e8750de61607f1b5293a184389ac43f25708ba2 SHA-256: 2f3f95a54c53bc8e6b29a8cbc24256bec5b6003ab0dedf99d23afec72a9097d4
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the presence of external links and the high heuristic scores suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=how+to+kill+the+big+crab+in+hungry+shark PDF link annotation
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ef2eb2115d795ecb7ba3d9200d566964/51592723863.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kirerikebogig.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/16881895629.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de796c9fd4---wetisolijexedifisuza.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/runuzekamojovefos.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/u4f6bdcvvjo9m4qa1jtndh41c2/megakog.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b57c9cc24---fevogopiwofexodemekiruzun.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c90c03732ff---gijipezud.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/rezosas.pdfIn PDF document text
    • https://telenovella-bg.com/files/parawuminowibepituzijira.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af699ccbdeb---gitufodugixefaxexilireg.pdfIn PDF document text
    • http://zuche0551.com/upload/file/77383891466.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/v890vmo6ad7nvb4oten63i4qps/jawadovegif.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb388f76d---magejebewimiletivujapita.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbea9e75a0---jeletedunenebatexamaboj.pdfIn PDF document text
    • http://boxethai38.com/upload/file/veluvuburebiguwaf.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/uoiae4o4f0bvtshqmne0hj6tu6/lagidasepovazasujapotip.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087eba096990---gevexowuketoninopututak.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uk5fbjtmb3o5lc0e4f1dn63pd0/fibenewilejulur.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c594319dfb872e5f5493e58b0f88898b/90049714732.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/48183548322.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/a3bc9b3a5d84264bac86c0ad11b5a205/sizenurevipu.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/besixera.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e48712f9---83196608989.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 18544 bytes
SHA-256: 3f7b7630b5c25313a1e32a8a0a573f858a9a9bbd2f30358fed5194ae0f4a33d8
font_01_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 11032 bytes
SHA-256: 9fc08b7b4569cc951a1ef9cc17467e2def2e84bbdf5a747ec87aea038b754776
font_02_sfnt_off00013159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13159 16144 bytes
SHA-256: 319c1d6b5a9dfe45ef2c311a2d5ba00a192ff2e3c7a2103ac7a27dba584f9d59
font_03_sfnt_off000146cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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