Malicious PDF — malware analysis report

Static analysis result for SHA-256 0686e5569bf816b8…

MALICIOUS

PDF

78.5 KB Created: 2021-08-15 10:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: a0f0ba7d74605a5c93a7e30070c978f1 SHA-1: dc3f73762dcb709d2a849154592110d3f95e9166 SHA-256: 0686e5569bf816b81af93e9fcf84f89acdac074fa1c3ac991c7d36bcd62ef12e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=stick+war+2+order+empire+mod+apk PDF link annotation
    • https://evermoral.hk/upload/file/1625527650.pdfIn PDF document text
    • https://granitnet.hu/editor_up/wemozudokefugurot.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ee735a983f084cb9055eb0ed0fcada2d/xenatudulijugebinupid.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/48886743126.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/xivimaduboruranuja.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/6o8pcco0q3bb8lsaqlitl5bibs/56417065609.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3b6de8d1d---42434530017.pdfIn PDF document text
    • https://koratspring.com/upload/file/sikuzidipefedunufuvum.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/3389095857.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160704712175aa---xejimorozifedexaxola.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210721005125.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/49241136449.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/434693859.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/nedurumasofafokilufujokis.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/l6n825mivsk3nkkjqfrve29hd6/jalinufijotipuxeg.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/kugabajedigazubojupiko.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/g0s60e3ss4538smg4pae2ivkb7/gelejediwifovanawizaxi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b38974691bb---nadewavabanowosip.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/22b24b605cdab898f8e57c457a66c5e6/befigiwa.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/tabime.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/duditub.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce81ec9f67---73978143022.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/vawakeruwuxawora.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160948a1bb6898---sonitefuji.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_off0000ce44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE44 10732 bytes
SHA-256: 0a37a0432c845a5b7566508a07d206758da4e861e32ba4c602fcbcf841397297
font_01_sfnt_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 17728 bytes
SHA-256: a62b27fa02434561df756562f20b002d2cf4a169ecddd275181258355a43cdd4

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