Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba377cc676615642…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 11:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c491f9218e95bc4591c5bac98d66b23b SHA-1: a61a053299e5c1e8bcd3ebd3ee8c66419d4550e2 SHA-256: ba377cc67661564239c7e623a62463a1776651f026ac4a8e9d53a42684dba9f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=paracelso+libros+pdf PDF link annotation
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edac429542---51700168482.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7da571b2a---lomupifafurob.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/xekakamedomiwapamajes.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/72emepsiflv9rjve5eji6fq6dl/97884396099.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/dunukopakigepegixezo.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107261446023649.pdfIn PDF document text
    • https://shibbirs.com/media/files/digilogol.pdfIn PDF document text
    • http://grimastone.ru/files/naveverenuwubaritax.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/fafig.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/66235872038.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jlbk4moiuch1lqdadpitovpjjf/29651700838.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/vedizuwabuzipiforovu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/30cid4qhi9bnhv1e61mtsq4341/91399845299.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/38bd5e6d0bacb7ee2ab53e34f74f6138/2878863767.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/88967276032.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/vekesoxese.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/34c968454c6df5421dbaa9b5b3d11053/xegebuledevu.pdfIn PDF document text
    • http://esistore.be/userfiles/file/sawomenajapidaluzeme.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/8995305404.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/fb29625ab4a7bfc11dfc9b98a4bc2145/lupit.pdfIn PDF document text
    • http://secretinvitation.net/images/files/45036849887.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ca7d6c66e---21536392630.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160768d97949ef---kusamiwoxegijedogiz.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/94529441409e39dcbc13ac17c9f5a67f/82089111351.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210807115511.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_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 10552 bytes
SHA-256: 14069663d25e8f68769eb817323af1c5886e1a96e620c6db0e883e37f3b219c5
font_01_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 18868 bytes
SHA-256: 7703fe8ca69f233deb859bea30693b2f916b130b2abf963b5d5fa0ccd924099f
font_02_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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