Malicious PDF — malware analysis report

Static analysis result for SHA-256 f736d4a9ec288feb…

MALICIOUS

PDF

83.1 KB Created: 2021-07-23 03:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb0385d4eb1628e2fd3c38c3bdaaad66 SHA-1: 889a22f2de83e9762d8a31cabd013bd0494666f2 SHA-256: f736d4a9ec288febc285a693e7f4bae277428e819710627c5382da4f069a7ecd
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079743820a29---xidufusofixakopasejumu.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a5d3945f---76698971370.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5436b3a5d76bcaf15020a55a45738be0/11479044563.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fc422a2717d91fd32c6b177413b254d6/duxos.pdf
    • http://ahxxzx.com/userfiles/202105/file/13279467477.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b3156eb19da---41897933928.pdf
    • https://rumputhijau.com/contents//files/71037030906.pdf
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/kigaluro.pdf
    • http://chataphan.com/file_media/file_image/file/28429271881.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/tb6c3i3o3f4ud34aunm2c69c07/laresutebopanur.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080b03060ece---ladababevinejabirasuzek.pdf
    • https://thehouseconcert.com/ckfinder/userfiles/files/40017438734.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3489db2f2d---63327389413.pdf
    • https://aarhuskortet.dk/images/file/5220823330.pdf
    • https://srinivasagroup.com/ci/userfiles/files/jegagufufurorigoji.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/buripox.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48fed532f6---fafaluf.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/mugux.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ddca73d47---20406455978.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a5808292---sunapiw.pdf
    • https://baobihungphu.com/media/ftp/file/zokuwigegura.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/a940a0cd4afd2bcc11cb4196a4c0c2fc/95517830224.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=transformers+mod+for+minecraft+pe
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d953.bin
ea0433384961e17824fcbb20aae4332434804cc9832ef0b6192629f9b88ec5af
pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 10700 bytes
font_01_sfnt_off0000f1d7.bin
61b30ae1aab4eb36eb0840b2b0eefbce4c07985e7e08a078464ad8879cb04de2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 16676 bytes
font_02_sfnt_off00011ce7.bin
478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 1760 bytes
font_03_sfnt_off00012542.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 16792 bytes