Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ce160ca61512ed…

MALICIOUS

PDF

82.1 KB Created: 2021-07-09 15:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10a1fd930f8eac3524670cd854454221 SHA-1: ca4f5a0d095efeb593a17e46e9346f5635227c8a SHA-256: f6ce160ca61512ed861608ca2fbef9ac2b01d642c6e21aaaf84d75bdefe4211f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised CMS uploads and disposable hosting sites. While no scripts were extracted, the presence of numerous external URIs and the link farm structure suggest a phishing or redirection attempt, likely to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/39087290003.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ba6ad1f9a1d57f0363211a14db2f18c/kugakabu.pdf
    • http://bigband-ulm.de/userfiles/files/16572801845.pdf
    • http://abogarestudio.com/userfiles/file/12532563939.pdf
    • http://files.ibiza-ferien.de/file/sutuzadejibiguvodolug.pdf
    • http://tuanayapim.com/rsm/files/9832505682.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d4a6bf5d---nitoraxededowadinaxu.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/23724721979.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ba0354842888d441f6e3e55b0b287e32/fuvided.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1df8a4340---lozojokakeg.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0ec8405283070201d49a48506cf3e8ec/suzokatumasiwumo.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160898a343bcdb---zunoginaxukifujuw.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d94801a77d4---wadowexa.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/85250847722.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/15bad20177bf5f105adc4d54754d9c05/48408961894.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d8b37021902756018bfa2b3de23cb3f3/kafeziwujek.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c620e3ed6---24192451068.pdf
    • https://farmstead.tw/farmstead/upload/files/48096403879.pdf
    • http://elmbbq.com/uploads/files/bodujipipikuzipa.pdf
    • http://kapelski.pl/userfiles/file/39573815752.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-25/20210525040938359129.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160901608df241---82117541486.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6834dc76f5c84b1a677670ee724b68e1/99205535222.pdf
    • http://goldartline.ua/userfiles/file/58626005825.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=epic+theatre+conventions
    • 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_off0000e03f.bin
532bd6a1c207685f9260f0a66ee2724b42b33ac0ebd5088802ecfdc2c83ab363
pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 16504 bytes
font_01_sfnt_off00010b28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 16792 bytes
font_02_sfnt_off0001233f.bin
f4c1af6988fdaf6bcd2910d26a9fdca5b6eef902c98cd0390d7d4d5c2929dddf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 10472 bytes