Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a874a3c0e735cad…

MALICIOUS

PDF

84.3 KB Created: 2021-08-18 01:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5418d47ee246c4cb1c2808015fafb5c8 SHA-1: 4c3ab80f836e4eb1ddea200ba22b51f7186e6249 SHA-256: 2a874a3c0e735cad08e0caf5a291dcd99b2332bc13bf395072ff9dcd46916909
156 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 distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=keep+talking+and+nobody+explodes+manual+sk+pdf PDF link annotation
    • http://meta-min.com/files/sebasodeva.pdfIn PDF document text
    • http://360global.ca/userfiles/file/25872811053.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a44ad00f08---mijinepovamigo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/31801523893.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/jegodu.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/likixitemifedu.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/34361640302.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bea9062c3---mamoginajilevijuref.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8152c577c---rudilezojebadizumole.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfeb2ea4e---51914160214.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/87602282092.pdfIn PDF document text
    • http://klenderbio.com/upload/files/kipumik.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/xoxiwip.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609d85d9de15b---votokakesom.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/rozevewetujofuniwixan.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/1862909434.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/18811257492.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/17726389833.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/n8r9ubkqvgbe51puenvel4mej7/bipodiwupuwedem.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/runovovivubazabapudijo.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/80561166101.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16653a105---jodexipubekanovazazo.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/tibozavikoguxumulumote.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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 11280 bytes
SHA-256: f90c61bbe6ef999aa0d342603770b07fe006dba5549b3d40bfe63bde2f6e9dbb
font_01_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 16824 bytes
SHA-256: 5df894117b677325cc3704cbd656cb9d65f51b7c9b2075bbbd65900d6a54e8c9
font_02_sfnt_off00012a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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