Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3e6dc1c6e63e2d…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 08:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a8d57964b4fe6834706a822d06e73e6 SHA-1: fa5d659b272f206fc6a889f9fe7a71b3d097f52b SHA-256: cf3e6dc1c6e63e2df09ebe3deb085747c06b4028a3c86411cd655c8225c3481e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or exploits, indicating a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609bed07a356d---22673656923.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/92ff05ac9202eed9523eab43c3962f63/dukigilegupubigajajaga.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/webuxosoramilo.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210825185114.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/bisarefujigi.pdfIn PDF document text
    • http://orem.mn/uploads/files/60457205933.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ea5ab29c---29423052738.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/44507015671.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/tuwepipuvawefigoda.pdfIn PDF document text
    • http://scsytech.com/upload/files/jawedujekebudi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a08ac1b2d---66889372662.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/neduzajemesujifabi.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0e2124030d0d59e999f80f73ee49027f/69162687965.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/wepijopirosumap.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/kinetizexi.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/kapuvun.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/28769193319.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6092fbd16c---nugewulixiditisoguz.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/badevopo.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/57225762264.pdfIn PDF document text
    • http://bwc.lt/i/xerowupobisavaditi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3ca6888a---66703092291.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/tedawizarewoza.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afac65026b2---gajib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=brooklyn+heights+map+pdfPDF 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_off0000b5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D3 18496 bytes
SHA-256: 60fa2fd11902148d585dad54e36760a0d635028d203a76a0595bf92d7fb2eb44
font_01_sfnt_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 11204 bytes
SHA-256: fe5632dbfec9a4deea9fd607ca6a377aa292fc8a8b6f5dd88befd3bd765b817c