Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bc6378aa94d094…

MALICIOUS

PDF

94.3 KB Created: 2021-07-24 23:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4bf6428c71cc13ac572b71f222f5241 SHA-1: e7ff7dcd888270fbcfba10ec8b4a1e36e124d78d SHA-256: b6bc6378aa94d094f9fc6d57ce60c401de85fcaf990acc725082f92c39207b7a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting sites. The primary purpose appears to be directing users to external, potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jacksonreunion.org/clients/71346/File/wurobibutulox.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716d0949cd5---vujuvulebegamejewijik.pdf
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/24076027784.pdf
    • http://thedewakohchang.com/image/upload/File/6744626881.pdf
    • http://aldo-ins.com/userfiles/file/87555218343.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/79759026887.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/40982859821.pdf
    • http://zonweringbelgie.com/ckfinder/userfiles/files/76395091154.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9jeqm7vutlpeooi0kbs2nbtlmi/90461960164.pdf
    • https://fotojursa.cz/userfiles/file/70399230144.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/13617361443.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16097e2f86f109---vasaruremonulixomaju.pdf
    • http://wecans.net/_UploadFile/Images/file/27614841648.pdf
    • http://biirbeh.mn/images/content/file/62145996671.pdf
    • http://ekolojikweb.net/upld/userfiles/file/tijejejofuxumubugoto.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d797e6adbc---16460344323.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6e51190j9rg7i4ith39afadjba/34158779282.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d607de8048---rodokazibitegutetefejob.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/37548023121.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/70056019527.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/68415366674.pdf
    • http://ztkammer.at/uploads/file/gamugasuje.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9f4bffde0ebc7c136f6bfd34543775af/6266433910.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/60309369133.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/9197fdbb0754aaf05125796ba3800fa9/8460615862.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=political+economy+theory+of+mass+media+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_off0001092d.bin
99602fac1b0466716f441af9740c3b8628feb37a899fd4f176d756e821b0934e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 11000 bytes
font_01_sfnt_off0001228c.bin
cce638feac6790f2d9b56fdcbb44121fee35d7122410b39d65e4c517d81abc8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 17820 bytes
font_02_sfnt_off00015008.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15008 16792 bytes