Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66d3f8da2fd3673…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 05:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5847d72b7231a1b15c24995a1e9948c6 SHA-1: 687cb3643f8d9f1c97fb7d0a728c2593a4bc768f SHA-256: d66d3f8da2fd3673bacce4205d714a30b0f0ceccafebfd81194feba4de1f4ad6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=where+are+whatsapp+voice+messages+stored+on+android PDF link annotation
    • https://paeonia.ch/userfiles/files/vubiwu.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/80867034954.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/79340217871.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/10977365792.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161328b334bc49---10161116750.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/xufotasonuxoramosog.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/93907365144.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/8606379726.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/foribinavatipilamedigav.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/mufositowarozebe.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/60490409199.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/18399515609.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/2083279898.pdfIn PDF document text
    • http://headrepublic.pl/images/files/janavawezotifel.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/zezoliwarasikajaxabupog.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/68439587501.pdfIn PDF document text
    • https://biomisszio.hu/tmp/29750379471.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/59259839112.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1b78141f---20465621624.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f64955925---62459494069.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210907120511040.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/11924872280.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/57502628385.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d90d2ad8---63057223937.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133acef912aa---jugizi.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210904071916.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_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 17728 bytes
SHA-256: 536acce7275eb414adb3bf3941ff898db414359f4c9b9f8b5f79f821b0c538b9
font_01_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 11060 bytes
SHA-256: 7c6ffa89fa08ce5b29b025e827873b076b1ecb3b1979b9f73d7bec0a164d6fdc

Open this report in the interactive analyzer, or submit your own file for analysis.