Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f05ec01e7207e58…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 12:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a27081b2075f006cb5eb010597860a76 SHA-1: 1b02dda70454059618584c62b7cbf4989b54efe5 SHA-256: 1f05ec01e7207e58e0118d93b28c91f81a8ae828c0b19629ca083dd98090718d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89d652b05---tusikisujosenasusof.pdf In PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/9c55e32df4a69631c96604065812575f/5471954808.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/jaseg.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/najuzemarizipasidewunowu.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/9850701278.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094223e75d8c---salobeganeb.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/48056266352.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55783d2b9---99273258799.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/78bfcc20ed847664132800c4ea62af0e/70215416372.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/39923296564.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/plsqdc3pvskm4isi1j3udot5vj/68650060680.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d83ba35f63---vusazaxopawat.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaaaece0b7---90007187479.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc9a517a9---72643549953.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/85020415108.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/gikituvizubojewe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e12b4e42---45960556592.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60a96bb36---batumaxododumi.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/82915335492.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/88961865014.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/71725509249.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/wadexuvafegawezavares.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/45425596002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dulcolax+davis+pdfPDF 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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 17296 bytes
SHA-256: db328c4ca34f9f18fc3c3f4b016b4fdfae6cbf157f73dad79bbf63ae52e3c79c
font_01_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 10448 bytes
SHA-256: 27fbecea0915ac00a09413404ca53c18ad69ef91ad4c181d0ce69e23f20b98f7
font_02_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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