Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcba5c3abfe411aa…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 22:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: beede8380e3ef83da7141f1f36fd1186 SHA-1: 2725ac0c2ffad17c7cb08f98f721291b89eace12 SHA-256: fcba5c3abfe411aa9c2bc1c97a6f0d7aa0233d02cf21ea7e79bb67d8246fbb11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://jenistudio.com/upload/FCK/file/37907470574.pdf In PDF document text
    • https://sainaudit.mn/File/86113865063.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/69955416450.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/69873340490.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/lowikajunujanojelonafigu.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/65909381514.pdfIn PDF document text
    • http://okun.su/upload/file/46976547095.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/tamijoxononu.pdfIn PDF document text
    • http://profstil.az/userfiles/file/90400035184.pdfIn PDF document text
    • http://metallpress.ru/files/91605164723.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/rorejebirab.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210905100650.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/16238446667.pdfIn PDF document text
    • https://maisonforville.be/documents/file/48756448656.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/47434179994.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vg0c1tdudhqv9ojo907eqtakq7/98443390859.pdfIn PDF document text
    • https://mimpishio.com/contents/files/22141319633.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35a2857a3---lojagekuxojezusawijer.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/78a7d64ae0449403acedee9698674376/gigetivekoxenerovelawiku.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/96384575993.pdfIn PDF document text
    • http://stylekd.ru/files/59436358417.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/33432946217.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/govamimiforuso.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/jixuzu.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/bamuzagosuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=caliban+in+loganPDF link annotation
    • 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_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 9956 bytes
SHA-256: 636a23deb733a61e32098a384f12cfdac90ebb435fc058c654270773fd138480
font_02_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 17480 bytes
SHA-256: fcfd6d78cf07dfc5421d7dc7e1a094cd8a0c794ce0b8efe6da1196e444d5cff3