Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dc260436847806…

MALICIOUS

PDF

83.3 KB Created: 2021-07-29 17:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ff20ea64bd95f385e5a17564f57681b SHA-1: fa2717e70df996996a27a76ccb0f77daaee60f4f SHA-256: 88dc2604368478065aebbde35d7fed72354844da3f6cc4bb073fe6f64db1882f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://php-lounge.de/userfiles/file/47506839228.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6a219c7cf---58806731778.pdf
    • https://nhorizontours.com/userfiles/files/tovipikasubowumasa.pdf
    • http://zhhyhb.com/uploadfiles/files/77625023269.pdf
    • https://tepihtrava.rs//files/mumopakolikegobu.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c1f242f63---20192570204.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5133c0c8e---toxapilasekofovolowameb.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad09925e5---kawebexewomi.pdf
    • https://myphi.biz/nbloom/fckuploads/file/jezojuxotemegajo.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/97846902953.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/94b9f2d8e5b6747a3ffa75ff636f8ab5/zapar.pdf
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/pezupifilusuxemijarajom.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13f083715a---rikirinomojevanajes.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a66d1bf2e84b65c05329c258363417a8/35111507151.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0f527413efba34a97caf19bec288b65/71203283856.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gupefepaxizedam.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/85133166020.pdf
    • https://laps.pl/userfiles/file/xifuxos.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/795c61c027e27f619eceb796b59e9e66/11502627746.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/lebafelakotonarijopelon.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2e67d31a8---2930079375.pdf
    • http://matchedtubes.de/userfiles/file/saxidaguje.pdf
    • https://betenagro.com/sites/default/files/file/luwojegabosiki.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610059c95a316---sifesewekidipetupenapin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=business+english+reading+comprehension+exercises+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_off0000dcc1.bin
f6fbdff26d06eac83d82698dd02f6af40a406d3e9e09aba719f871fd5165d577
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 17364 bytes
font_01_sfnt_off00010a27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 16792 bytes
font_02_sfnt_off0001223e.bin
7444b52f580f4b0bf6e3935105e4b9506cf3d6c0d28b86a0171322035b15c6e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 11224 bytes