Malicious PDF — malware analysis report

Static analysis result for SHA-256 29309738f8767bb8…

MALICIOUS

PDF

99.1 KB Created: 2021-07-20 05:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d36f8a969fbf6d1e3b3d39509477833a SHA-1: b56623cd32f5d0a6f59f8363a6f7c8a62c271d11 SHA-256: 29309738f8767bb8b786aac202d12a3162d3a1ba4ffd4dcee1abf086a497f766
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm and compromised CMS uploads suggests a phishing or malware distribution lure, likely intended to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/esd3ve1685laatgmqnhflo3hm9/fepavoju.pdf In PDF document text
    • http://thedreams.cz/files/162759912.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/repewijetajojogozem.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbbb1cb7ee---64281704309.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/16277611348.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/11698329721.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a6c3c202a77e49f1c778185db41ab1da/siriv.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/30329635517.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/divapelosagawabumi.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/78972495517.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/9eeskt6vi1ohtaifqmn4t251gv/48299665137.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1a49a352---42629409846.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc30f3f468---dekavad.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/negozabaziwunubijebib.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/55811304d490d8d04c69c9ba99f483fb/82927646389.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/q1l7cfo700lqua0fq4mjn8q644/pewazekigimuderijemor.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/kojarozutowurilezok.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a9b5857b---88057390271.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/88315993994.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/85672228961.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/t2trgtlv4fllnehd0lcfbl6gmf/22651256042.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/96118595470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=convert+pdf+to+solidworksPDF 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_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 18572 bytes
SHA-256: c6fbf41dcc76d547ab4fd9286a5146f8dbea21b88f932d77c2f2fca44accf810
font_01_sfnt_off00014ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166ED 10604 bytes
SHA-256: ea30acf2d92763e938d5494867c95e9a8b23d1a07b7875522b6d87f688156994

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