Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99fb0745cdd8a23…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 18:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ec34b0e9cadd9e1302bf3739dbcf77c SHA-1: 0413d1d200ad8607ff379e400c0acb0346e2eff7 SHA-256: e99fb0745cdd8a2326760d1d79af81134feb857b5ef86ff462de8613fa0c5bc0
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f566bce3fa---jegolag.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/324dfdc51c07e7488763839fc66b00f4/vuxudabebofetufibetepu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160813e33a9afd---49474410766.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/97171150111.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/8so4eovjbpj022o8juo9nl19iu/namuxesijakanexobos.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/1396982903.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/4837163782.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/29317fe10d10df1bc6200a5da7f7a7d9/47885153169.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/vanajesotigawetasafo.pdfIn PDF document text
    • https://kimcert.net/E/file/xepusowozuluvogomo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d53b746e94---kunogalilanatukijitatux.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/domodobeduzebutogu.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/jopujuvusima.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/r3oqavj2knp27flng3eohklhlq/12318010093.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf1b6b565---ramalirironod.pdfIn PDF document text
    • http://medrea.ru/upload/files/lopanosutemomakanog.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/sovexabefukut.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/rovuwegijobofenilis.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/muwibol.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/9220055236.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/sjco2q79bjigm55uf1rvlmv0j7/26168381167.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/rixoturemisitulesuzomalo.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/rowitepadewufesakun.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/nonapovozasi.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/94999908407.pdfIn PDF document text
    • http://atya.eu/files/file/85372941526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=beware+dont+read+this+poem+worksheetPDF 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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 17092 bytes
SHA-256: 67d91cbd6b318a493c270c4a68b03905d4a57fb33555e1061446d61a602e8531
font_01_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 10840 bytes
SHA-256: 0c739357170c166cfd46c36458f18fd1c0a710bdc3c4662b852b2488f3223b4b
font_02_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1