Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2515b9be0e92f1…

MALICIOUS

PDF

75.8 KB Created: 2021-10-04 03:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f63832b60859c835cdd306c09fe3e9e7 SHA-1: 58bb11640552fcd6c84c53222de238423900cdda SHA-256: 4e2515b9be0e92f1763aa302cbc013f56236faf141ffd6135a2b1c57ebb96ff8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=cst+and+pst PDF link annotation
    • http://straps.by/ckfinder/userfiles/files/10991719233.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/vazasamatug.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/21d68859f709e225035ba2125d217ee0/97704883389.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/dagiguz.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615971fbd88fe---78455220546.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/35642227793.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/nelepisupuze.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/4674248063.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/pobujusomobebidivotop.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/kebigononazenizubafareju.pdfIn PDF document text
    • http://rcpolypacks.com/uploads/sikil.pdfIn PDF document text
    • https://noddy.nu/images/file/saxovadogeditamex.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614b520429fb2---nanigawo.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/83494038359.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/vivawetagowazukabezefuw.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/tezixaxosisokomit.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/48231210524.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/95290185729.pdfIn PDF document text
    • http://coolscape.info/images/files/51368834623.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/48067065560.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/77756721758.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/3544636567.pdfIn PDF document text
    • http://husplaza.hu/editor_up/69618940222.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/kojosirekiv.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_off0000c00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00E 19876 bytes
SHA-256: faf065abde1bbdcb935ed6438f6fedcbbaa0e51830483195d27e6697b38d4368
font_01_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 9924 bytes
SHA-256: 94c750740d79e22f4332406d788a39f592512fe1baeaff3de45a77abe4f4c97d

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