Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a5fa0dc2368eba…

MALICIOUS

PDF

84.8 KB Created: 2021-07-29 17:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2cd0935113fc852174dfa6567c58ca6 SHA-1: 2d833c3f016bc15787b0f41777beb87413c77972 SHA-256: 02a5fa0dc2368eba33dbd8413821250b3f7761e9d6730a42c23313a4f4807dcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=safe+scrum+master+exam+preparation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c39ea6443---98762801631.pdf
    • http://hopkins1983.com/clients/861771/File/wapapeweruwalopi.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ke7ivk6gmqku1flsaglpb99jrd/sugolalamevokefozotiz.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/dcdf840e0f8daad5bf8b939e4ac8363e/71971593796.pdf
    • https://digireg.lu/upload/nezinasuzikebi.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c3c77aefd9aec1e2596af4c28b0d03c3/37880643249.pdf
    • http://sklepjola.pl/userfiles/file/mejutixadupez.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ef8479c42---90949436603.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f6tp8d0nkr3f2gsqtdnid6a8c1/54349896901.pdf
    • https://pendekaremas.com/contents//files/jikajulabuzutoful.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8d8a86aafa5d4f18c87a7bfbf4296cd9/larugoruxofutaxixo.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/xupom.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ch86geqaki45e9ogi1t9v6slrn/zaxesasedepasikimen.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8b2d36b42dfc2d3e252799395f827f16/kumubogedalonejinepufibox.pdf
    • https://bbpartner.cz/userfiles/file/46665798782.pdf
    • http://hoangle.vn/uploads/userfiles/file/26239283353.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef3fd3654a---wilutobagelimona.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f9bdb33004d435647e778c9ef0721046/7254960613.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd351327eab---63304494712.pdf
    • http://eotp.info/sites/default/files/fck/file/kepejomimu.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/tofenowebobesetuxu.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098688fc05ab---norazudejizego.pdf
    • http://autodilykanka.cz/cmsimple/images/file/89459340803.pdf
    • http://mai-colle.jp/userfiles/file/68030417866.pdf
    • http://toitureetfacade.fr/data/Files/zasodawasidokabo.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_off0000e849.bin
a8f92d0fda0455202b501aaa15339177f670ef1f1e54edda0c2c91f411e3c918
pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 16920 bytes
font_01_sfnt_off00011475.bin
cf9d42bb1942f23261b1b5d9387b9b648a54a987d73945276175751d7ebff2b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 10872 bytes
font_02_sfnt_off00012d9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9A 16792 bytes