Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedd05736a33399b…

MALICIOUS

PDF

83.6 KB Created: 2021-06-27 15:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b9279714962f79a778ccedd8577708a SHA-1: da6936fa1d7f1b542c5e54ac85c4292ab9113a52 SHA-256: fedd05736a33399bfe6133dd3d38a1837cfcf0c191d9c08a7b5703ec00456aca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=grey+i+miss+you PDF link annotation
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/hvliinparb1hkmb57fmgnra6g5/zabevojirujenezibakod.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7d944cf4---57722869630.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/fibazaxeriniji.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/4665779606.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/969744e9d01af9a7baea0e9bd1bec984/84238127480.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2b322bf3ab2bbe0a5620eba44addfbd8/25934595683.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/81454130210.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/66696221664.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853a6e93a56---lujijolinufekifofuwesa.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/ludebun.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/04dc051c8b814aa643f7a6b3883c856d/mopofowekogij.pdfIn PDF document text
    • http://bociany.sk/media/file/gibodifowaradiwomupezek.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07036c1666---26543225590.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b341932d8c---zimuraw.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8f2ec04e3d5afc21571bca7c84db275b/39007236772.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/p5j74723vn686duri4gt9ufi5q/mupunano.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/2ffd5d92d646964ed3e7872e628847cc/suruw.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/5144369508.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3d3574d3---pofaxituzodewolik.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/p21bq6r700c2arn5i84a87gc80/62505758291.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/89afb411c086b7e1fa340fe5a0ca1a64/30953029808.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad51f69296e---58589249707.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 18760 bytes
SHA-256: 88bf5cd367bce8749c5618f17e5f1e8cdc1d5af083b39e34fe5db4446a1ee28e
font_01_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_03_sfnt_off00012884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12884 10112 bytes
SHA-256: 3dcc5f4c6d430a5dcf4a047926499b8d10d3d34bbce7b2ada2b6c75d0ab252e2

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