Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a896576baa69e5…

MALICIOUS

PDF

87.7 KB Created: 2021-07-08 04:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d9796a746428a49114ba4e65ee790ada SHA-1: 4915db7f7cf550bd31aef5eba9f6f13581b748b7 SHA-256: a9a896576baa69e54d44abaf5bc89ce4099458bc21dab07de7cf560386ac8e9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous unknown URLs, many hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://logiccpacma.com/ckfinder/userfiles/files/93013912790.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/bobiva.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/35806c43ac37568858eb822a8c3a60b1/savivakunufikokomiwurijuf.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/41921903647.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5u5tslupt347a7cni4emjvlcvs/69827931191.pdfIn PDF document text
    • http://lawngo.net/fckfiles/pekaze.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c065424f9c8.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/nuvopasoditefolewexaf.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/dogoge.pdfIn PDF document text
    • http://sns.hu/_user/file/ritim.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7360610d665676074006132931643eea/giwirasevux.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vnmd7296j6ah630usn73665ka7/sufarila.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6316bdbaa---savitomegelufetagujovon.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c4ddd8b5f76b5166ab9a250d3d7561d2/jepekuzovuwakaketaji.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785b8a8c201---8732488190.pdfIn PDF document text
    • https://capecoralliving.com/media/file/zinasagonesalufofa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c8b97f3b6---minefalafenonofora.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/rozulafuwasewatogu.pdfIn PDF document text
    • https://orrizon.ru/images/file/nezezuguwaloxam.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/c4abn456acptah2242eqjrnf51/sakudi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/307mbknpablsp1o1pkl0p6s4i4/77810781273.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4cef6b7d30cb39bfa5b0b2db28530f8/97245858170.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/nedomuwovotukim.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/40175594150.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b59f0197e1b---42446998072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+are+starch+and+cellulosePDF 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_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 17824 bytes
SHA-256: 5d619e7d9c035dd7b9bea9c75df1d8e9ece8e3388b204233b623fc2c30113ba0
font_01_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 10468 bytes
SHA-256: 483359b081b07d2560864cd6656618b7eea50e284ac0932596e972801ecc9ce9
font_02_sfnt_off00013973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1