Malicious PDF — malware analysis report

Static analysis result for SHA-256 709013fe2115b63e…

MALICIOUS

PDF

92.0 KB Created: 2021-09-02 02:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c7095c9ed7d0e791097deb95baeb4af SHA-1: 9cdc730d03b9b8be77a2add616d2606fa3b74cb0 SHA-256: 709013fe2115b63e6b7769b31f6bd4370f7de475d6e18beb5e2afaa616d432f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=bad+blisters+on+feet PDF link annotation
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4655601d81209814110c6ae88418b894/21796876766.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/33924112886.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/4854855310.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210626215544.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/rododabigesalinotelama.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/lexate.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/85662437642.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/52bd06e841b488a8a76ce452a024109d/dukoge.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bad3bee3cd---wasalozatawazowak.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160738b5eed851---gefovanisewuzuzoxu.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/72196791219.pdfIn PDF document text
    • http://apart1day.ru/file/42755373034.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5ff96164354d1c96c2736e7d26c58033/75028123806.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160745a71bf810---54932617434.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210828_134955.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/sozota.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/43627212603.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/nemix.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882957c42d---salusuk.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/67326399454.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611deb2642cfc---timatisegudexesamir.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/88488665982.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/suzixo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077197386681---zewisug.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/7blgpegc07bfg3sagjpqpveov5/50759571066.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_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 18780 bytes
SHA-256: 6dddc1ba84805bbb22e2573325d26f6719cf184f734a7c5c89ace1f5664422d9
font_01_sfnt_off000130e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E0 10540 bytes
SHA-256: 29603afcb8768b335747e8f8f40df9f728a578149745e5750df86aad7f9dceb5
font_02_sfnt_off000148ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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