Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7181024de85da91…

MALICIOUS

PDF

106.9 KB Created: 2021-08-25 11:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b816e9de4afdddc6e71550a61c49fbe2 SHA-1: cd1c31146977311e49f3da52c85e423493dc147b SHA-256: e7181024de85da917b905af25616cbcf9a97faae8ce96bf0969e71a264aa51c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/f2nubnem2sjs87mi70jblrccbq/30924342509.pdf In PDF document text
    • http://studiopignotti.it/userfiles/files/77244945695.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/puriwakezivit.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4836cc2284---61055986371.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/fomozisivoxibelanagibomuj.pdfIn PDF document text
    • http://meskerjager.nl/media/files/28686106555.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/71572220243.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/83902291140.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/96959498260.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17340c09d---rutifukulewufogasa.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/bbse148g5ha2d4ohok2qthsbo3/bosabun.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/79412515249.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/1191133545.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160963b3bc317d---55249440004.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/64381820310.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7287e7e6---12630384302.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fa0850e1b---57327413280.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/rexopimikix.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wopusugugabefonasel.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf887a6e5b4---rotajajal.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085aec16f89a---sadekajuk.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/44599007458.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c447a441c79a5fb795c3eef5c1a5feed/20684971860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=top+coworking+companiesPDF 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_off00013c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001547c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547C 10716 bytes
SHA-256: 3188c51be6eb694624371ddcf1f147a0a2cea11b0be338468c29abd497dc8007
font_02_sfnt_off00016d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2E 18220 bytes
SHA-256: 52dd6f17a3d4833d64f1a3b924dbc209266a495e037ca8125736624a12b0d273

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