Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf9b19649c26fe0…

MALICIOUS

PDF

108.2 KB Created: 2021-08-11 14:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d2aa90c54cbff490177ebac2dd3648a SHA-1: f0f58fc046a8f34245017e33da7fe8df4fb485ed SHA-256: abf9b19649c26fe0f27f949c3e9797eb9446860ed9d89bf688db5570807d4318
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/70f62grl1nlp5qa6lp2m1q19h1/34211729088.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3bbd9a6e3c6a9097bb122c9d7ab08032/nuxiremobirefurina.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/32584152999.pdfIn PDF document text
    • http://flexa.cz/docs/file/35385469115.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fe1675020---83275813603.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/7378228380.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6b485030---fikuzegumow.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/getoxuwujuzuwazegokeki.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/morotadida.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/gudaxubiso.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ddeb896f8---bafelaxizukegafi.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/nebuvidipo.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/23464523338.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/76350468342.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40e603b97---demotagug.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac327ddd3b2---wubasuvu.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/61381393336.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba018b41ff---romefawuninexasaxajup.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l0r1k0e80r2j2a18jgrpt6nvt5/23428037000.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/31111358905.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c2d971914---14951592838.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c72304ea2a0a4641b196387c7b491a7b/jerezedidajanafozeveziwer.pdfIn PDF document text
    • http://headrepublic.pl/images/files/lorog.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/nilamapofefil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=respuestas+del+libro+fisica+conceptual+de+paul+hewittPDF 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_off00013a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15297 20064 bytes
SHA-256: aac9dd7f410bb0116ba68494ee8bae5c7bc7d76ead4dbc5ae91506fca3233e25
font_02_sfnt_off00018707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18707 11088 bytes
SHA-256: 14187000e2a819c3bc255015f4428df5855c434dcf665d6c89d089249dc64023