Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead76f7ef87974fa…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 21:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 275b36fde9c99779861018a346323010 SHA-1: 8f137e5e0c6fb73a3657e15a906c8839cf8fc48a SHA-256: ead76f7ef87974fa55c9c57bc211ae23dc413c0face3c093963f1fea8f64a36c
176 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 redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=car+android+player+update PDF link annotation
    • https://ifbscalidad.eus/files/galeria/files/wopodarijunijazunenikuka.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d77de838---vikevetidejowosaninojonuv.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/39569502968.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/kijatawux.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-8/20210908233530914486.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/wenosolavefatebajab.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/4493499096.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/93613826000.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/18851522465.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22645e8fb---vewebixurikolopite.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/mojogo.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144be1f377fc---sibaxeso.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f8a26b870.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907022323439620.pdfIn PDF document text
    • https://il-gusto.com/images/file/wepotepajibalavigon.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/peladeg.pdfIn PDF document text
    • http://altus.pl/userfiles/file/damesagofebulakiz.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/15661144168.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/pemopeteged.pdfIn PDF document text
    • https://allianztc.ro/files/file/28508942520.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff745ddf30---13301777763.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/pizamimem.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/7967222452.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5b7ee73f---31545819344.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_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 17600 bytes
SHA-256: d29000bb41babf6124c7d0184ea9c3145bcedfa19161ab19f5c2c89250dc77bd
font_01_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 10460 bytes
SHA-256: ff9a4d993f8a6e090f3f75b369ad25949ec8eae83058495b5e51aafe46fec6fd
font_02_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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