Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c7b5332d729d01…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 06:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce1e48f9f81185c5d0b4323b1e271cfd SHA-1: e6b7a8b97c337193fa76efa1768aa8b0443f7773 SHA-256: 41c7b5332d729d01262d9ac78a57c2d398f513b302825f06c5702a74c7001a46
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised WordPress upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were extracted, the presence of numerous links to potentially malicious PDFs suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087120d9473a---62292313303.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/330b1a248ce65c3393ebeffef30f6f15/lufenagumulemudawopa.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/76fb09cb7f15cae2a57c4f3acc6e777e/14147748350.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6e1c69e09476f43305e98ff47843f975/gubopapezilad.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/gjoo5mqs30aobb0c7qgpc7726b/nuximaxowato.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb1f44b2b---93882344969.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160989a421abbc---jamuzapojofegetoxu.pdf
    • http://studiotecnicomartani.eu/userfiles/files/88954363033.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724161d1c6f---fadarabojobesibagan.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/014f8a5e659ad39d3ef374e02e8bbb3a/82641423059.pdf
    • https://facades-et-traditions.com/actualites/file/ditutisena.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacdf459f34---fekutovatux.pdf
    • http://markasib.ru/ckfinder/userfiles/files/vukosew.pdf
    • http://cosyromania.com/media/file/romozubajivexavimefotu.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6491714cdbe67c3d67ba4300dfb12699/sorixunema.pdf
    • http://srividyaastrology.com/userfiles/file/zazik.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/19b78t5goi9p60p3neotsnqp93/vagudafutujopejukemadoka.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bca7d87ea3---52345016747.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d6d68b21c0efb30795f95ba01e7fc68f/wiretexizenozozavevenopo.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4a9ec7ffb5fe038156896f3bc7cd309f/xexekojatarinojixolug.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/hqe680mev62mgivh1kvuijdapp/48939473528.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2d950a69fc3d99d7ae9c232e2cac1097/fotidibajab.pdf
    • https://lescourailleurs.com/upload/editor/file/zulefadevojulemomive.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928bb5ad8ae---34876462069.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b309fc01423---pawalil.pdf
    • http://nail-free.com/ckfinder/userfiles/files/8492614591.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=promise+to+pay+rent
    • 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_off0000fa23.bin
0456ad20fe53c3ebe46912071d9cbc03348c4195e1e41f696b37c8a61b4117dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 10484 bytes
font_01_sfnt_off00011204.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 16792 bytes
font_02_sfnt_off00012a16.bin
c0650388e1ad6d755584811f4bf65ef0e623d71a2f101c3ec0b257821d51ffaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 17280 bytes