Malicious PDF — malware analysis report

Static analysis result for SHA-256 44acf2e047636892…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 11:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 953269ec1ad11aba71dd6d577683ea3a SHA-1: c2cfb3a0105d2d5e043593c0171c2c38f84b552c SHA-256: 44acf2e047636892afbc8c6bb5cf53bdcebe3a35e2ac00e700bc9fa86198f149
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links are indicative of a campaign to drive traffic to malicious sites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://119hero.kr/userData/board/file/raxakum.pdf In PDF document text
    • https://tadimtursu.com/image/files/50003010785.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160856b4758c54---12115866713.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zuredipolatezu.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/nezoxukom.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/luzolulananaxodepawumonej.pdfIn PDF document text
    • https://mar3ol.com/Files/files/riwag.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/41438184513.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8a5d666e---buwamonipobimerirus.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f907dc2d591---464929082.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/folit.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160714d8a09b56---14499973425.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c30abc08---rurenazavo.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/55868134198.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/tojumupomavasewezaj.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d792435c3e---didokedof.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2d6b09e26ad35e9e8cb341b40d2a32e0/14494165266.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/miwupakefi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f0ffed37cd5c8c5241f184d39a72b24b/zoridizeluzavawelef.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/mazawufivab.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/kamen.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7d05c125ea653afa548b094e63f4740c/63178361827.pdfIn PDF document text
    • http://goref.ru/files/file/35626430123.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e0410c7331dff062dae19ad59ef78361/36766167791.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d436ceaaf---kewonejopasaju.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767cda13b6c---38943825770.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/37864437166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=geographical+map+of+europe+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_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 17984 bytes
SHA-256: 46e9dbb28923f45953c6d0d4fdbef98b48996597a02a477af5835981b6e3846f
font_01_sfnt_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 10836 bytes
SHA-256: 8b4aecff810c6183455c84044affd697d99e406379dad912d8c100959472a9a9

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