Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae24dc4d3da9513…

MALICIOUS

PDF

87.8 KB Created: 2021-08-01 13:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8cdbd60fd775f8743bcb45bd1b2917f SHA-1: e6e3ec3e5ccb7c1d4e9ca5df5d08b834a58aa6cd SHA-256: 9ae24dc4d3da95134ad451b081ed1327916d22c656843d998ff180abcc81de2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

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 http://familiehollander.nl/images/uploadedimages/file/rebefixijomilonerumedani.pdf
    • http://summitremodelinginc.com/userfiles/files/semevufufigapop.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb05da66a---mupokomituzomipivobi.pdf
    • http://asja-doll.ru/userfiles/file/93782106335.pdf
    • http://gramercy-grand.ru/files/file/turigabewovuvokemi.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4eef4646d372cd0478575577b70b5a3c/48933482652.pdf
    • https://appchecar.com/ckfinder/userfiles/files/zixik.pdf
    • https://cdmsig2.com/ckfinder/userfiles/files/74307614622.pdf
    • http://3bbb.fr/ckeditor/upload/files/70096483317.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/neboxuzalag.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174179f823---4585383200.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289475fa93---jediporod.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/qhg2dipc6n2o0mnq46kq7he0gt/94955354024.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e958f7b1d4c5093ee769b2d94839e3fd/76195319067.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7bd438c798493e9d5f9d13aca80bf8ea/44878209663.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b48550c17f3---saladopomitigupoxulifiw.pdf
    • http://ofipapel.org//ckfinder/userfiles/files/93922239666.pdf
    • http://breakevenpoint.pl/uploads/editor/file/bizododu.pdf
    • http://gps-tw.com/CKEdit/upload/files/75983681673.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/4488165585.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161065f154baa7---82205898226.pdf
    • http://nedirajtebosnu.net/userfiles/file/kivulinuxokisus.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/prmjts8mfva0fjnadf24d38nt3/40635549788.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b9e78bf67---siride.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=malik+from+house+of+payne+now
    • 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_off0000ee04.bin
62579e4021df137956701515aa5f7415d0fced265acfa31955c016acd1b4d954
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 10908 bytes
font_01_sfnt_off0001071a.bin
6e3ea388ace977df23933a7b6d88879a42cdda618e508b454b28a3285b7788bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 18040 bytes
font_02_sfnt_off00013694.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 16792 bytes