Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c00c296b2cacb6…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 16:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 464a3ea65b377fa5cb113ee4fa61a1c2 SHA-1: c5198f9ce35059c2be302d098f3167053b33d953 SHA-256: 35c00c296b2cacb6d65975d13f6195ab1166535b70dd87d7c3d2559bd758a96f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to numerous URLs, several of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://uspeh-kursk.ru/ckfinder/userfiles/files/jumojaxuvuminopodegabis.pdf In PDF document text
    • http://goldendazzle.com/upload/quangtri/files/94697685260.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/jegopal.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/67bca8e6d51168208a6b45c3f951b4ed/95561160768.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160968abfe4593---24759162014.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bej5eqpmac64b6eg3cn2n9i5v0/33083405551.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/82724336413.pdfIn PDF document text
    • http://lblussana.it/images/file/92242474899.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/xegapumifikoxiwuwoda.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/87580354308.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/jeluzewat.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/37990975874.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a429f1ee7d7---27194944764.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5bf7b7952---48508006218.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6897e7d50---bevagajibet.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3860f3c003483bacbffa7de927870185/24539401349.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/df7208b8b6d3d7b670550b51055a4ff4/kavuvig.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/83255266882.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/54644916835.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/kotusofiriguwatuji.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16082561b87075---59863222499.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161052cce2a73b---zonadilorisini.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611faad311dba---raxudu.pdfIn PDF document text
    • http://nensi.si/upload/file/rokulutobomuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=johanson+blizzard+syndrome+pdfPDF 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_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 10968 bytes
SHA-256: 80ca0922efcd0d134e63d2b0f4790e178ba73fdaff7ba1e77c20ba967a0a05e0
font_01_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 18396 bytes
SHA-256: 571a95c72968b41060d33dbcd506fcdcfe29e6199ffe6ca46672b2d8bbf522d5
font_02_sfnt_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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