Malicious PDF — malware analysis report

Static analysis result for SHA-256 e815b1835526d993…

MALICIOUS

PDF

81.2 KB Created: 2021-08-20 06:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb515bdda1ca57fbcdc9e0d58b4f4106 SHA-1: 43b8c194abe2691593cfbd5c02ccc143d9627e26 SHA-256: e815b1835526d9934cb5cb7be838f09f2cb283e75ef8032d4b55ff55e6a9612d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the overall nature of the document suggests it's delivered as an attachment (T1566.001) and exploits client execution (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=my+electric+hot+water+heater+is+not+heating PDF link annotation
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa3f55931---kitotutominutekipomomusi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087a660d7c46---1939689668.pdfIn PDF document text
    • http://esistore.be/userfiles/file/foresupimetapabeveb.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ao8m2t7ajf1vea3cic5ef97nb2/67502227134.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/xubamadedowewo.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b16325d6d2c0e60e9b4f724e2d8970c7/rugikix.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/96556748454.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/38162511864.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/94493559376.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c1c5175e4---941789071.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/9916797494.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/94876429407.pdfIn PDF document text
    • https://akvaguru.hu/user/file/39057731377.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2ce4d14e8---bukomodid.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/83085681826.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/keriribozurubigido.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/nutevazuxuwilibapikofilun.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa13dd14f---9819883248.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/4ee9866946ebb2256263676acf79387e/87062739617.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/tilatura.pdfIn PDF document text
    • https://menu2uplus.com/images/file/73611732412.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/43577327527.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/gaweg.pdfIn PDF document text
    • 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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 16048 bytes
SHA-256: 4816b28c2f87524b12c00193600b622d3e0400201720f3fd36fa379ed8443e17
font_01_sfnt_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 10700 bytes
SHA-256: de2e65c8c676884569dd399593c8964bddd8b6fc639fc75f3064aad09bd560a3
font_02_sfnt_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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