Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83b4611313a02f7…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 19:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3753e94b7213aceda33e38fd20e40ea6 SHA-1: 2b5eefb3f32da9da29a974e992edb79c04d073ca SHA-256: a83b4611313a02f704ed176fa36d8100b407df9bb7931c185452bbad1f4417a1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/35oahtuij2njhthv2dp3bshlc8/garagezakape.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19eba8665---pogeguzugoxibitigu.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0so598158jp2tqsnidpmbkfig3/16362121395.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/onb2qdj9gmr13vpcvl1m595469/fajuvagakiwozaguzabivogob.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3da371349---katavu.pdf
    • https://affordans.com/ckfinder/userfiles/files/4548326438.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/e6c8t5dqh5q0aqr3amcdarnbl6/49067780516.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11af1669d0---bewupotawewego.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/or2tunkncbrhu853kcmttuf1b5/fojekuzonixazor.pdf
    • http://hykylalumni.org/userfiles/91212841015.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cr982tu67svrcnbaa84fbjpi0/56799504163.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/03357e3b4a0de93ca8d7e6b36889464d/98065665917.pdf
    • https://allcreaturesinc.com/files/files/lutuxelin.pdf
    • https://aartipalette.com/userfiles/file/65286434909.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075647ddc750---mabire.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8806445e42ce6d0297159ce3ae4d5ec9/62329674896.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ddc9c1c7a05cce89de6dad9a98e1edc3/xobelapulutexi.pdf
    • http://4reality.cz/userfiles/files/3917154877.pdf
    • http://samrayburnclassof1980reunion.com/clients/873185/File/3441868045.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/87525402592.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a217c468a03---riwavefoxefoju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=claiming+head+of+household+vs+single
    • 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_off0000ee02.bin
466c3ef046855fb604ab866167b0e325b28d651d48c018d5146e400685540055
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 10800 bytes
font_01_sfnt_off0001067d.bin
8d0f8f2ba8ac850f6a289743eae29656ed22805a6d4fb18088727becc7c38790
pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16204 bytes
font_02_sfnt_off00013064.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 16792 bytes