Malicious PDF — malware analysis report

Static analysis result for SHA-256 986c9fdc5c801fcb…

MALICIOUS

PDF

79.3 KB Created: 2021-07-07 03:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08fe08f0ffa4a4edef55b5a9f76131b6 SHA-1: af0aaf77c7b49eeb5ffe1d2388d98e9feb6dbd8f SHA-256: 986c9fdc5c801fcb62cddb0ca68568cf35d7e47033f0f24ddedf0438508f047b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. It contains numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The PDF structure itself is designed to host these links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd25af4090e---wesip.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d39eea714a2---mavegiv.pdf
    • https://everestart.com/images/stories/file/57182788718.pdf
    • http://hydrogears.com/survey/userfiles/files/misoboxegobasew.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/enutj7r77ulnde7kk3jarplifr/gabalusez.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/11e75r4r7vgdbi3q51teaj8pd5/kuxijufalumepifapinolugut.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4ac129812---subudijak.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/fd8542ac8b46f6e6ce7aaf748e54eff3/raxovasosarusolorebifam.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9069c29e7---gukojeduwuwoxitozaruget.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/40899202150.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d197a339c9e---vevurukoxoweburerinilarov.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/amv88ejo8bn44j49dcbko0u691/65168883488.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd7d3473a---menazibamotaxug.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081506cb54c7---toxutivibuvemorapaxezeju.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b2e1dfe6fc06f938d03bbeb6fb56f53a/83938170065.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/akgoptst9g6qinnlb4lv5pi6j6/14238862185.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3d3272f51bf6d428cb1545c4bc294641/90014118578.pdf
    • http://dwhs79.com/clients/15834/File/zuzejejofevew.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3619338d3---fudoledatonufekinugedu.pdf
    • http://ahxxzx.com/userfiles/202105/file/tijikexafepiwozomimexo.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3f707c7fb885ab30bf05005fabd734d9/98176453414.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b549f3edccac2cef648f9aac9d48bbdd/kenobarafexafizafunat.pdf
    • http://vodnik48.ru/content/file/pesekoxed.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b0cc9031a5d50307a23d7c9a87640d0b/wisigowunupo.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16099f1c3edc85---gozokozononogifis.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a89b1719b---lesibovobaxozesen.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=somebody+just+like+this
    • 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_off0000d26a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 16792 bytes
font_01_sfnt_off0000ea7c.bin
d899070b70e660ef2ef51c5ef0f16fa600c2377f0809ea096f45fd70398650fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 17140 bytes
font_02_sfnt_off00011733.bin
2270e8419aefabe7db45c9fe29a205bfc49a34d239cb02395bd95296465f05ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 10796 bytes