Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fd8ba1e79130c4…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 18:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 608e7fc0695f9a6b1094ef1140c575e5 SHA-1: 4507d1be932bd460b46ae8d49a04689265c574cd SHA-256: 92fd8ba1e79130c4576fb0228eb72efda8e1e3169dda5936cfb923d547d46bd2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://inwebjor.ru/uplcv?utm_term=download+novel+puputhamzah PDF link annotation
    • http://lovesenergy.com/file/72071639522.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/14068768023.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/32578268061.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/56797456785.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/bumixijududof.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/mabali.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/77754028303.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/76707770958.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac41e495cd---98539591523.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/99844074753.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/madetavekoteso.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/32192346700.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613244e43a5b0---18369051564.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0f021b41ad1a7fe9fb162d9b898eb148/12520962048.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/78831720700.pdfIn PDF document text
    • http://schokofontaene.de/idata/mevufejamolaveroxokeke.pdfIn PDF document text
    • http://vizcsap.hu/files/file/86758497996.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/livateritijobamedava.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/gajesebigamujunukesiro.pdfIn PDF document text
    • http://hkalc.com/userfiles/56315114212.pdfIn PDF document text
    • http://www.polni.si/Images/files/35274888006.pdfIn PDF document text
    • 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_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 18880 bytes
SHA-256: 05929868108258f314c7bb77bf417c99d40175b5742fac875b5dd0ecff0e777a
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10608 bytes
SHA-256: ecda26a549e2d4e5229cd3ee2db045eefe48ab1e4c5a389b48307c3f40e75bca
font_02_sfnt_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1