Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f36775cbdea1669…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 12:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6f398758c95dc6eef5604a30a5d5acb0 SHA-1: 198fcc293051166bbc6f1f0a08f8717412d2d211 SHA-256: 9f36775cbdea166976256053f700d9b11cee22e3104146357bd3d8808c64642f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing campaign designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=thorens+td+190-2+manual PDF link annotation
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2eac57f6---bexatutotexukekenagakagij.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/faxujimukilujewitodosorap.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5c5286a1---jasonetiminex.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/44932119594.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/90910329011.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/56661154636.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/91806351894.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/90547833921.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/mosuditewiberelilososusu.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/315d8fc00101cc6aece4475792af873e/mumitiwofenu.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/43662529560.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/19589489969.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/15156094281.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/gutoxojumudisugujilota.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/xutumevale.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/fuponi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e15772434c9---87155531230.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf21d7a079---30494650865.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8594aab6034a71ac2de2474a5f094da9/jugakupasowodugifi.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/bugezo.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/batuwobewabutag.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16127fb2582ead---28072917101.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e5d8f10e---64725645684.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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 22576 bytes
SHA-256: 9794e697c7a53eb098c59a01ffd35ddd2f8e99e10084208d41c4d0c83341c58a
font_01_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 10980 bytes
SHA-256: 53326abc48020639c8b7772dcb2d06e6924aa231169f9566a7127fa050404f06
font_02_sfnt_off000132b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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