Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95e4c66858896a7…

MALICIOUS

PDF

95.4 KB Created: 2021-07-19 21:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 263e2dfc69349187cc8c63bc00fc0d01 SHA-1: b3c80b01b287e7de3f48a40a51e32eaaae9dca21 SHA-256: f95e4c66858896a721ad7352fbb4a73e60b3afd7094fb094da4b15248ab14b18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of embedded links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fb41f140---47116229900.pdf
    • https://hunde-katzen.at/soubory/49756598872.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/63711805869.pdf
    • http://okwecare.com/usr/userfiles/files/videnumeta.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607897a52562c---61677065993.pdf
    • https://mvpartners.be/images/uploadedimages/file/4980488604.pdf
    • http://chinasoftcore.com/userfiles/file///16672025781.pdf
    • http://www.moyekolodin.com/files/kesugedavuxunabipa.pdf
    • https://menu2uplus.com/images/file/21775985524.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/38963530671.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0rsr1f7pbi2fbsm7or99blah75/vanegejagopetaxasexifeda.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/0c2e5257b28e954a5e92434cec5b2cd4/disugonudazotawewivoxuza.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/86953053413.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9b115edbcebc626e947d2a3b3ed23fb1/63794869685.pdf
    • http://cn-biyoute.com/d/files/41810463463.pdf
    • http://fsoa.cn/userfiles/file/razerabazefakajig.pdf
    • http://allmedicus.com/userfiles/file/40791158235.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160df2815c8302---81676847683.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c940d8aa79a---lomexefama.pdf
    • https://angkorphotographyguide.com/userfiles/file/79468251804.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160762fd3c0359---2763214091.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/d268t3u05ggdmbmkt2q6glsdb0/60801761198.pdf
    • http://sungsam.net/userData/board/file/pikefimabudixujalijomet.pdf
    • https://justbuymeds.net/userfiles/file/sepabuvudomufimigak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mount+and+blade+warband+serial+key
    • 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_off0000f0c5.bin
690f88060bc7ba068bff89b2e49fc16c045873a14971b2ba5fcd253b16683855
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 22088 bytes
font_01_sfnt_off000127ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 16792 bytes
font_02_sfnt_off00014004.bin
e3f644f1c999d586db7f78b436ba06d6d6d5cbde9266974914f50df3f8197ce2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14004 10768 bytes
font_03_sfnt_off000158fd.bin
0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x158FD 16416 bytes