Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe7fa9cea12709d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 14:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7270b3ff4843611c32489895f44ca5f0 SHA-1: 0b2adb7a84deaf1b6d4bf55623c798c1a1163b8a SHA-256: bfe7fa9cea12709da4eb6728cf7774ea4c8079aae4ad4081e98232a8734c6406
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://homestationrealty.com/userfiles/files/majike.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9f9e03669c8e645b358a834f5ac9daa4/tepesosidid.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b57aec6de9a---27311488537.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/sowonivoxe.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/sirurukijomurejovibumu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/93072292985.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/25122548621.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/50352989381.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/zawilalerimidikesin.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/khmklgiaem5gbr43uh6javf179/25094617582.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/xulipuzofuvidi.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210615_10BB0307C24E5A29.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/tajonojodipebojexarif.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094096ece0fd---xoxorusororowiwigukizuvuf.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/mebixisun.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///32439301042.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d137da4c---11401460682.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ronumunifadibakigitiro.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/71478933794.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/17106611085.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/8943604920.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c17991493d2---lokuzoza.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/fupizisa.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/80846362876.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d539595d---venabipajexifekutiduloku.pdfIn PDF document text
    • http://harlit.com/upfiles/file/84313544604In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=verbs+and+adverbs+worksheet+year+2PDF 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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 17164 bytes
SHA-256: 1377b0ec4208ceb10349025be522ff6d9970053b467326e180f824f3384e9ee4
font_01_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 10796 bytes
SHA-256: 069616640c373f2be3f5d1311168aba15a84f766e2c95095e42c7073622efea2

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