Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4656e1dbb5b40b…

MALICIOUS

PDF

76.3 KB Created: 2021-08-29 01:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11268bf542e6ac14952f0b632f8ba6ea SHA-1: 2e475fa2740444db56c67345fcd6f9192287c9e9 SHA-256: 2b4656e1dbb5b40bcc264f9db37537579fbdc895b07cb093ed546cfd9410707e
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=another+term+for+best PDF link annotation
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/477c64957a2c5b10b89ef98952be16a5/pimoxedit.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/nugum.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/1020653798.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/35168913300.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8a1bf29aff6a09636c0e577237ced40b/76246663968.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ccb3521c5---46615520903.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/10627819709.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/40818933760.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/34909373262.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/94820551657.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcc426ae20---36396867970.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/491197290.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/72958877188.pdfIn PDF document text
    • http://farashimirooz.com/files/88822982550.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/duresoluzenivimugu.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/gubidu.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/78093692198.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40be25e81---gupipuvu.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/24353078625.pdfIn PDF document text
    • http://www.bash.cl/media/file/duremud.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/88626278022.pdfIn PDF document text
    • http://budka39.ru/files/11892159393.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d185f5fc1e---80191355390.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6ojdbs33mqkpek5kt3to7vr49u/65717373077.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/goxuwidadatefifofowotolar.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_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 16728 bytes
SHA-256: 4427b3b0a5ca3fd03993410c55b0f5b616943b8b22d5e99b7d00b8fa43f1f565
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 10300 bytes
SHA-256: 5d4b3fe4c16ffcfb9d78cec0badefaf55abba34d44a6773e6c1669bc46033ce7
font_02_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.