Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a690fc83810b2b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 07:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f80adafa28fc780298fce71064c087e SHA-1: 1487d3be09171f10f7cc63cc679eb5749cc78742 SHA-256: f4a690fc83810b2bdee42ede8824b49f7336948ff32968070f34bb50cc5aba3f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to these sites for further exploitation or phishing. The file's structure and URL distribution align with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cc079742a---30962967300.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tfhsa528ld4svauh1cv23f6pai/sisezuxudetale.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/50e75d9d832204067e2d4ed89629dad3/pufogevajivefuwo.pdfIn PDF document text
    • http://beiks.info/public/file/47423232470.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160955725592ac---70606390416.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1626900575.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f4c08bd62c2a27bd45210f557e7055e0/gitirunugotobef.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/89548257286.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff9ab92b7---56039951038.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609adc4137f5e---40877184118.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/juvaxewufevilevube.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/36509959902.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/beraf.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160823eef040a2---17542401477.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8af9a676f---buduperarexot.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/tapelolexepefokaromiwarax.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/femunaxofebodojugukakolum.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3782c40de---59826835563.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/fuvozasomeronixakiboti.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/xasominuzaragusu.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/40728262711.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-7/20210507012440315819.pdfIn PDF document text
    • http://foodchemsino.com/d/files/25830162801.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8td0bajr2uf089i0nti1s1opn9/44561179431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=numbers+in+english+practicePDF link annotation
    • 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_off0000d1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E4 18380 bytes
SHA-256: 0da5ce6a36193343f6626faa1e975bc26a3d87752194f44225309e2aa3ffa55c
font_01_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 10920 bytes
SHA-256: aec781300009fb41150b5a4838d5cee9cb9743ca83b9b0fc7b661ef1512cd641
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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