Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9efb48d9546c9c1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 15:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15c77d56d5c1d858dcf89b2e171f7c4b SHA-1: 6de64fdd0c1db0e6c5e3455d6a590c0f7980318c SHA-256: a9efb48d9546c9c15fa9fe22996bcbac55dd0411a17295a3a811dbce05c8adcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised or malicious websites. The presence of these links suggests an attempt to redirect users for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://theloanwala.com/userfiles/file/84539164394.pdf In PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/34615273827.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/63470614573.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/xelodarorobetewowoson.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/61697803763.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/23145921574.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/mujavevitibikedorediju.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/29849685140.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137387daf353---6645817260.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/52809548348.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/guragutinulekuxagir.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109011508541903.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5446d229---37418535971.pdfIn PDF document text
    • https://blogsma.com/files/92461190587.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/29277071821.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/27043729173.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/22310933315.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba10ad686---golokafebatajofow.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/88430637256.pdfIn PDF document text
    • https://titishop.co/upload/files/gesikeve.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/11117104346.pdfIn PDF document text
    • http://lg-palette.com/upload/files/99722261740.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/58887969355.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48880b23a---dufimogalunikajimonamuben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=name+some+social+problemsPDF 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_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 16824 bytes
SHA-256: 3c16dd19f7632fcfd925191f216bae625e479a4c93e14805f435e1c5edb47284
font_02_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 10452 bytes
SHA-256: db90d68842c160680a9dbc4c117568f474dfef87d583d743fb73c29d6a721ed3

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