Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24474440bdfe034…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 16:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89787998619140c9e0e62a40c97a400e SHA-1: 333c6b7c49fbeefedd3b1f5d2ec6631641477ee4 SHA-256: c24474440bdfe034f0c7c702ad6a726702c220154d7a4b4c4ee79fe92168c017
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.hmgfinance.com/ckfinder/userfiles/files/gasip.pdf In PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/fedoxotexaverip.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/64846208325.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/neredujikiret.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/55214415221.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/gajefituvobaxogono.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/543f91398bf8ca14fbbefead23dc0689/wijinufitatobon.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161376b421a53c---vuzabijojebugajanomene.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/revaseriruterofamexegudul.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5utr8b3v2691c1hl6io64v0j15/gigibodo.pdfIn PDF document text
    • http://nktrading.qa/file/files/13082804723.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/tudixanamadavo.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/97575015600.pdfIn PDF document text
    • https://noventa.cz/media/files/file/97522588687.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/nufopobusokate.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/56511504807.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/tazafaxekudesipuxibagifes.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/regepimuni.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/vivakibenag.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210904085219_6si97x.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/diwuditina.pdfIn PDF document text
    • http://reichspfarrer.sk/file/71767508421.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142014bafda8---12312998725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fts+18+hack+downloadPDF 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_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 18020 bytes
SHA-256: efb0a4cf4a3e28c9846496eb7168f0eb706ef65ab5f2b626165dc8e44a7ca9a1
font_02_sfnt_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 10560 bytes
SHA-256: 30684b89d3d941f6ecd72f408d3ecc277162393f4a5422dc1432ca10e8398c79

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