Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12a6f3d3c299fe8…

MALICIOUS

PDF

77.7 KB Created: 2021-10-09 06:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7feb004e80239fedfdd473f42be96bde SHA-1: 531c2dde6edd1fce00a1bdfa952ac053a5456267 SHA-256: e12a6f3d3c299fe8a3eaa179d4ad4e4cd8b024b6e13a1d7fd386250330faf86b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The PDF structure and numerous external links suggest an attempt to lead users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://virtualpulse.eu/UserFiles/file/mekugikowoxiperot.pdf In PDF document text
    • https://ego-sofa.tw/uploads/files/202109251350487040.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615193b97bb9c---dujuvekabikamakalobazusug.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/55277214013.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/luponivaj.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/33185406464.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/43024683772.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/jabonasogivulib.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/mozodivoposixunuda.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/65526614026.pdfIn PDF document text
    • http://czyxchem.com/upload/files/jemokanopopitajokukixoxa.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a327f6a5e9e7bf7e6d74fcede35cb7aa/vigudawapemetifa.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/5664932572.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/5309940747.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/76386354606.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/pukijaramijenofubok.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/jivuzitidofidepe.pdfIn PDF document text
    • https://finliz.lt/i/File/6532772319.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/74726844205.pdfIn PDF document text
    • https://lordoptika.hu/files/files/jajubekesaruf.pdfIn PDF document text
    • https://unitjaya.com/contents/files/xalexadabirej.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0d9de5a21---dokivigevevegaxul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+amerindiansPDF 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_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 17708 bytes
SHA-256: 200860b5694549f885b0ce2d08c20a770bf701ae5c463ebd991fe1b2f3f73f20
font_02_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 10592 bytes
SHA-256: 8c7fde39eed9bab5a6aa2629a4527f8a1662f350de3b311b1d60f6f7dd30199c