Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c217076a76fa3f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 03:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82e4b0426143fdeb62a3ad830f22a838 SHA-1: 01f7f23673d374d81794cf9a91ccc807517018fa SHA-256: a0c217076a76fa3f577a92facec09827b0a3f1116e24032c20eaca25b0c61743
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely 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 0.9975

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://smidgel.ru/uplcv?utm_term=t+distribution+table+one+tailed+pdf PDF link annotation
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/tenusileputezoz.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/11351636920.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160846053da3fe---wavonugojibak.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078599a4faf6---42417106702.pdfIn PDF document text
    • http://talleresjpg.es/img/file/tipilimatovupid.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/2858625939.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/9545518192.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/66407980192.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/wanivoseb.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/o20998ohnj9gsirvp0kv1al6l3/45717734560.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161197098e887c---dafix.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/pobuwolikikebese.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160838ae7a8b7d---16288832798.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106161314439544.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160796610561d4---36090833497.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b4512766a7393848680174bfbf297847/10187649378.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/fomizezinajokisebed.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/tejogupojiwarunosoni.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/61010579542.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/monomivepinatug.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/zivenefawokusudakegatu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bec7c208c---lixudefevugawaruvojego.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2692bfa65e0048849f0fc298d085f965/xogil.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/25930915107.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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 15220 bytes
SHA-256: ef20664a14595b7c2b11713c6d125c3a6790bfb6ef682a27b18242fe1e276e26
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 10692 bytes
SHA-256: 4b6e777dbc46694e5791d4e4340508184b50ecefd1431e484c760c74f2532bb8
font_02_sfnt_off00011abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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