Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d390b164e09f1b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 14:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 306a80d9d8c1984a486db3bfc096b604 SHA-1: f257175b2e34823657d80eae6173f44199a4edf4 SHA-256: 58d390b164e09f1bcc26a50129a73551da8204e6ee88b7b365e4a62ffbea3510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a tactic to distribute malicious content through a network of disposable or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135074a3f40e---dadiwi.pdf In PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/vegofobavavobolubalonej.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ledaxolufezapel.pdfIn PDF document text
    • http://com123.vn/uploads/file/nufutodajidakex.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/punetagitu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161420b5071a06---27178047750.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0e18058aadd59d0bc66ee5eb04a7983d/73447141831.pdfIn PDF document text
    • http://runo34.ru/attachments/file/ruzuwon.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e535246cf3---68180450949.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/movivimuwur.pdfIn PDF document text
    • https://plasy.com/uploads/file/70327989714.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/81567109397.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/borutozuligewamaderoxiw.pdfIn PDF document text
    • http://esistore.be/userfiles/file/piletawuzadelel.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109031030546366.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/bawevolaso.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/87081896261.pdfIn PDF document text
    • http://stylekd.ru/files/livovifo.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/90849822421.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/fefebi.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/rodowoberusodedud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=apk+sex+game+downloadPDF 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_off0000cd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 18252 bytes
SHA-256: cc7e4ed808252dd766e134f507ef26f44df05f9c21e2fcc6a6ef30418565024c
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 10708 bytes
SHA-256: 87dc31a2094b66ea03a3881fb98cb61ec4f41d90bd165a85891d417ad44977bc