Malicious PDF — malware analysis report

Static analysis result for SHA-256 c373a8847c1ab5e1…

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 15:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de60be8de9a1b7b6c2d278fbdc60382e SHA-1: c139b7460c7065c322cbed373499f894d32ee200 SHA-256: c373a8847c1ab5e1f7003849e9e7ab84adf9ad2e594000ca4360d7587f6c5a91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=down+by+the+bay+with+the+hanky+panky+lyrics PDF link annotation
    • https://noddy.nu/images/file/35123870280.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/madulixat.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/34485254134.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/50623143896.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/mizaxebum.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/zunelubig.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/taluzo.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/73891788081.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85184e8eb---1766171781.pdfIn PDF document text
    • https://pixel.bg/img/file/98730801408.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/pomovuwumaluvidip.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ohrijtovutnd1ont37mcbdsd53/jemigozexekujoxunajoki.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/4222381524.pdfIn PDF document text
    • http://land89.com/ckupload/files/xumomevolej.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd1089b15---66083792910.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/newinabisota.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161372b611b720---mapotaxominaz.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/52451725351.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f948104ba4---kotibimonapeped.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/pudaxosimidunuzap.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/dedijur.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_off0000bdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC0 19260 bytes
SHA-256: 74bb6a450fd5cccb32706271cc9ffc049ea6088c2a45ec47bbfca9b4a1518624
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 10904 bytes
SHA-256: 3f513680dcf703c9967ffdc0db7991503e749b4609bc0f063f80fd14aafac14f