Malicious PDF — malware analysis report

Static analysis result for SHA-256 132cde7025785c4e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 10:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc46df86e89897b691d23233342f2bee SHA-1: b17b43db7e892c18670ecdc717e3b6e7d1c7393c SHA-256: 132cde7025785c4e55f57d70b75f7ae1d7e8d085154718285716018f6c1930f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=best+free+pdf+to+epub+converter PDF link annotation
    • https://beautydent.hu/editor_up/magixobudukawebavaloj.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/21253742485.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/30803390248.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/kovufuzedutuzeg.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/93437105755.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/85635706697.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/8830999892.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/bamel.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/retawenovuluzefiwa.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/defesixafuvetogigozenen.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/wuwagefikulokef.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0d45aac85288676a755bfba16f14a61b/46616589056.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/50772786943.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/lovosimorikodupijomi.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/18867887310.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/kaxulufamolafafabi.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/nitateg.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2adfe2e19---zoluraladadaxomok.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356bd712502---tagisasawabivaroninatazob.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/36221550122.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/5640130007.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/46997956426.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109080845062756.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/sajaxi.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210911190339860.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_off0000ceff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFF 17404 bytes
SHA-256: 379aac2a27a9e8ddff29978ad09e9c2c3f52942abb62d06f8c549605431a7741
font_01_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 10672 bytes
SHA-256: cd9c1d6cbe0af62c7eb62925805947449f60871d59dfd7601f4661c149b469ab
font_02_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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