Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e7a4e0346e7882…

MALICIOUS

PDF

90.9 KB Created: 2021-08-09 01:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44a5d22f485e69ce1b78f2601c5b11e0 SHA-1: e467e1a75e35789b2800e1eeb18eb51299e48a91 SHA-256: a5e7a4e0346e7882f1df593b8dfa87894fdbb0df58b208c63f53f26bd4f6603e
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs pointing to various websites, many of which appear to be hosted on compromised or disposable domains. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://archism.ru/uplcv?utm_term=can+onyx+get+wet PDF link annotation
    • http://scales-center.com/shop/fck_file/file/bivobagenabunelitejovajux.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/75275594779.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6bfd854b76071e7e162ef34d45514db6/43348254792.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7bef733ac0f446050d7de3037d603c79/66373305232.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/fejuzolugofazepepudab.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096432b7afb0---mejaxele.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/d90e9910e05a158c321a03f99e1bc0a9/bufigebetazifoxo.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/25272936491.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rjcthkl00pu25jtqvhfd5djrcl/vogijelotokugibepu.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/74141081881.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/pamuvori.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/63969273610.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/12867086765.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cd0273de786b01b3f7b1cd3ec96cd957/93349448423.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/54877497353.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/mevujavifiwosepi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/revemolufovevut.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/96551850306.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/97065797597.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210617184924.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/88361956569.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/vr4r69rvr5oohdgkba6nnh15sr/38000213467.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_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 17208 bytes
SHA-256: b027ba35783771a388097ad9e27b76d82d3bf879507f9552b23c0b167d2a22b7
font_01_sfnt_off00012dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D4 10212 bytes
SHA-256: 98e3ab6cdb496c63b525ac01e6b5285603905d4619e0a3c443a023a44f308c26

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