Malicious PDF — malware analysis report

Static analysis result for SHA-256 8168b6bab2ad1793…

MALICIOUS

PDF

86.7 KB Created: 2021-08-20 12:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99254c702054185fc95cfc4c64691e82 SHA-1: 3de74f6c9db020c449b22c22a788018db8b5dee5 SHA-256: 8168b6bab2ad17934b13864d838e10efb786114a9a8fcbf8eb1a532ee6812d44
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS upload storage, suggesting a lure to download a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.alborada.es/ckfinder/userfiles/files/mupejulewelezexajajufox.pdf In PDF document text
    • http://sys-svinding.dk/userfiles/file/pobokinefokufus.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/fomisaxip.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/xovorisifi.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/tuzixixegabedi.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/goxizulomaxisopesifolop.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba27eba71f---botuxonup.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c3471f6498dfae144634f2683f03fc78/80381339188.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/94774c8001dd3bf7954944aede7d3ecc/pulipuvitesakuzixatofetad.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/25791611187.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/81662934732.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/setexulibuwedodatam.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/40f8901416a6933938033469a3c98495/57264651624.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/68984502888.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/dutigobig.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/64259349070.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733242ac985---94203770457.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/lui6vkjbk8cp9pu22i9iouif43/melabagewomafiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b525bf04---mowiwujebebijobasomegixa.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41894dbe3---bulofesapabijixalejijug.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/mifebof.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160826f9f6be6d---zadupimojobusogarojokip.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/51992871396.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5f14bfa8---nerusedafaku.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/90061590404.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/0b763a8dbc382fe94d20d938847b7078/9634528022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=jugar+age+of+empires+2+online+gratisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 18068 bytes
SHA-256: f35131ec9edeff17b65bd721019f6143ae7e099e49162f88d58f0133a9e0e274
font_01_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 10912 bytes
SHA-256: 72dbdb1f521aed586699d5c37db608f0bddae65867d59bd5b71245c3bbcc48a7