Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d115af3fedfc88…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 21:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cee19af05772a3c113b7ade374de5df5 SHA-1: 67610da36112eb439e9290864456c4cb4f393185 SHA-256: d8d115af3fedfc883e3eb6ac541ad1c1e4ef10e8ed4fdb6d435c212419eec664
104 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 http://westernmaki.com/uploads/files/36498890804.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3koc8g2j5r2pba95q9371f1nq4/bezupo.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/71358282623.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/43344249429.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b4be3b5f5---38076533154.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/mf1dafo8gc3i3tocd6kp48a5p0/mutebovefumubedadapinon.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e39267eb1---76967697984.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc3fe45d40---60040969686.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/76133197600.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e7831cd59---bafomejami.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c30e46365c24c7184d34e843d389f179/70517182613.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/28m4d8ot3vfvmn2aht2acue1lm/femitiv.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xixetiw.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/16972532639.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/mejonod.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7fd884a49844f1303cf5cc406712222e/jidodulodiwokebije.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/penolopekevax.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/35e8184d7927c901d611499b5433eed1/siwonitejetef.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc8c5392e---gatatub.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ac77f2d77ae80cf0e9538c53b984ac0c/27775889504.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/vudugupusorajufojozu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/dorim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=let%27s+go+2+workbook+pdf+free+downloadPDF link annotation
    • 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_off0000d015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD015 11012 bytes
SHA-256: 4da9cfad80f10b7cd198cb6b4b4d594e28c827a76f2ce2f632d64c1ba7988c9b
font_01_sfnt_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 17272 bytes
SHA-256: 38464d0048b477ee1c73a7104be61725da8e7410681bb34cf249a8d30a5e21e7
font_02_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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