Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f83cfb03dc0a4dc…

MALICIOUS

PDF

75.2 KB Created: 2021-07-02 04:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d5c2efd7639c6f650ae5b20b9f6c407 SHA-1: ff7b4128c224733601fee51acab3baa841be324b SHA-256: 9f83cfb03dc0a4dc0409d7e59d8b130574c5cddc3e27bb2f2deff909cf52d99f
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains. These URLs are likely used to redirect users to malicious content, such as phishing pages or exploit kits. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=when+it%27s+sunny+in+spanish
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10a7b2e2f5---32925081336.pdf
    • https://service-panev.com/userfiles/mimekevu.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d047ab63af6---40129154390.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a405c5e18---fipufusaxezuzopawogonud.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/32ko17nbsnis845i3d8etbadn3/57061417576.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/6bf873f1b45abdfde4069edd20682e16/tipala.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160799ebb903b4---6677706704.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb2caadc6---lunezudewipero.pdf
    • http://interno-kazan.ru/upload/files/40493223048.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b9095004---25435038845.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821dec19793---46780322728.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad859affe8f605a23fa59639d940b526/51579392003.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f6e1bc485---sunukonakanibapa.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/45656b518c5bfdcaa87fe5aab13bb4d6/76309728090.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4950024e8d8f8a6c17ca8d0ff9598a6f/79809572263.pdf
    • https://baxsporthorses.nl/userfiles/file/bowuvenodakaligal.pdf
    • http://banphimchuot.com/userfiles/file/rumozinul.pdf
    • http://sunrui-ti.com/d/files/petuxijegosazavep.pdf
    • http://botosani.ro/img/uploads/file/vuverajezijim.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00e35de31---zowomifipiwapo.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/d12e8885ceb4db91556a93490eca3daf/jiraku.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609db82d75109---56885923725.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c956ef99d57---92144979826.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac15a51ac---29755633830.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f0681cfd840c2970d6eacf40f8406ead/57167785759.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f3.bin
0bd69e9970cc30ec9295b129cc678cc4099482b15d73c7a157f9e8071b8ba8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F3 10324 bytes
font_01_sfnt_off0000dc4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 16792 bytes
font_02_sfnt_off0000f45f.bin
354cdb8269a7d8837a5f1c8c7bf6582dcfc3b02a198ed9dd60a0af9378c9867d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 16680 bytes

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