Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f86bcad64b0c18…

MALICIOUS

PDF

85.7 KB Created: 2021-08-04 02:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5a88008a77571c4ed6d68c94ca2844d SHA-1: 458d51fa8ff1eaaca90e3e0bece4c82b15de908f SHA-256: 22f86bcad64b0c18bd1412a3cfc90746d69b27475b496792d3a45691d83c7e6b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to various external sites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://diaochue.vn/userfiles/file/78598151452.pdf
    • https://ajur.rest/uploads/userfiles/file/55088074821.pdf
    • http://henca.com/files/details/file/24069985062.pdf
    • http://boek.se/bilder_umeny/File/bejarubi.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16071bde10b046---dufef.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ovnqot7t8tqhlta2s9n33j2tk6/99274688614.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7789a0683---tavegoz.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/0lu9ds8s2c0th9nnsa6csm47mp/masubikotuzojamodefozoz.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/jemiwirisutebalaxag.pdf
    • http://glastergroup.ru/userfiles/file/pifupebenoli.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1ca6890a6---temogaxo.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8b7ce10606403600cb657fc2f98d0934/52213670946.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fabedc944fe---54675616102.pdf
    • http://arabic.cz/ckfinder/userfiles/files/kabumujixunewitefodowur.pdf
    • http://systemsbiology.at/uploads/assets/file/73841345753.pdf
    • http://imailbox.nl/images/uploadedimages/file/kopiwagokesiwad.pdf
    • http://emeat.ru/var/files/koxepito.pdf
    • http://kotolantopeni.cz/file/53740687462.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/c589a4db5f78b1f62aa839405dd82639/4800776676.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0f772987---futebudapix.pdf
    • http://danchrisjewelry.com/userfiles/file/31731834536.pdf
    • https://grup-insaat.com/userfiles/file/42016301317.pdf
    • http://gfb.it/upload/fck/file/relavajizaroberibosuka.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/xukepulajagiketaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=idrivesafely+final+exam+answers+2019+texas
    • 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_off0000e8f9.bin
af2bead83b69628b483167e2a2b2ebb59dcb1ed26e8e68a76fd5384809542b49
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 17448 bytes
font_01_sfnt_off00011693.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 16792 bytes
font_02_sfnt_off00012eaa.bin
6510f7b8a6c4d8e7c0ebdb90fa25191cd0f70230074a7ce9c12440307a3de7ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAA 11176 bytes