Malicious PDF — malware analysis report

Static analysis result for SHA-256 3251a0edf469934b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 11:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3432fbe33648f6fd851e258d229322cd SHA-1: f30c47ac464abb1ee4bfe37c33d6f7a6fae36354 SHA-256: 3251a0edf469934b7e0c9fc80fa0738c80782b7383bd2ee6913c4f011db4e7dd
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous URLs indicates a primary function of directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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
  • 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://jubileejec.com/userfiles/files/tapuravenumunubinex.pdf In PDF document text
    • http://kredoteka.ru/uploads/file/91939358267.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/16979849386.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134837082bca---42636373038.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/vejoji.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab481a41fe---21344298499.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8e857a298fb66545433c689922e0db2b/bumifamezuzipo.pdfIn PDF document text
    • http://belloverde.net/emailer/file/30504157629.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/bebugora.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/3367063691.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613238277bc38---dolodepiladesezi.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/90174157031.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/61378c576aa5a.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/9973374570.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/q3m04nepdqnfsn93issmta9prk/5997073613.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/26902282462.pdfIn PDF document text
    • http://hasyo.net/files/file/69882840598.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/29483646848.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fazuk.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/75183971771.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/mudiniv.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/mezimoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=qr+code+reader+from+picturePDF 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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 10620 bytes
SHA-256: 8dabcbfa3bf56677e9fd28872dd8ac21b41315a91ee0cfbecc852f920439acf1
font_01_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 17744 bytes
SHA-256: 74d6ef6c91c2b5e0706fd74d319c00a2e5826782e023c2234e038e34b9b1b7db