Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0f1361827c9939…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 07:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16ffcbb590bd6fba5814c7d49f929e86 SHA-1: 8636b3ad4bedc51ea3b4f2ece290a4221fd6c9d0 SHA-256: 2d0f1361827c9939ee199b4b843f3ce15f8e7b0800a7e64182bc56101e5868a6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to lure victims to external malicious sites, likely for phishing or malware distribution.

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 https://wastran.ru/uplcv?utm_term=android+to+iphone+not+receiving+texts
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/f1svve6ci3kgsfvdo1975pfmk6/47816117621.pdf
    • http://megatex-plast.ru/pub/file/valoraj.pdf
    • http://falconfam.com/ckfinder/userfiles/files/dosivinar.pdf
    • http://chuabenhxuongkhop24h.com/images/files/vazosa.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/poridese.pdf
    • https://santa.my/images/users/00000000/files/japanuwenolenovomefug.pdf
    • http://huzatfokozo.hu/editor_up/36467939825.pdf
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/59149429400.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7fa3dd6fe92fb959786be631dc7c1aa1/55587320238.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_101934.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161414afe5a7ed---zofedexofoxagenejovu.pdf
    • http://myucpb.net/userfiles/file/vejusomanibo.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6fcbcd3341d5b3ea8b37c88f61bbb6ce/4407824461.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/53bfa7cf6947b12d511b689cd5a280f3/7976429074.pdf
    • http://chinazzjx.com/d/files/4821641887.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/gobezonituvipilunujuwilig.pdf
    • http://theloanwala.com/userfiles/file/mefaxowodafubitizofej.pdf
    • http://sahrugs.com/userfiles/file/80991803919.pdf
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/xamafofojadazefofuvijig.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/dowevuwodavodisu.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/6795415989.pdf
    • http://www.ondebiz.com/userfiles/file/28598325700.pdf
    • http://www.rify.us/cms-uploads/files/5465870740.pdf
    • https://biomedchita.ru/imeg_master/file/jefuzemovelagunogapajowef.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5jijhr6na3pqbte2j5f68jlni7/fuxijujiremezobip.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd81a38271---xiguzonajuni.pdf
    • 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_off0000d852.bin
489c451842081ba73b595c820a3d456af7bf4f155f3fea6ef49e92eccabcf89f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 10732 bytes
font_01_sfnt_off0000f0bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 16792 bytes
font_02_sfnt_off000108cd.bin
76f75336a64f5d855e0068fe63bfb57e7925862fee9c5bde1f21adf1771d6df3
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 17868 bytes