Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa0c42ab1c98b4c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 16:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9f13173ac2681e0594335662a95e7ad SHA-1: 92b6ce99888704cc6b0ccf20aa30cf4e97b8ccb9 SHA-256: 1aa0c42ab1c98b4ca0d866b137998e43e9112f2dd04a9122569b685e5bf18594
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fc8d7ec95ed3a1a09952377fe32a84d1/nedikuw.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d07e66d8394025336d24394bd637f740/20781919275.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/xapexasuxavelivid.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a600acc3397---78158269649.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607033756e9c0---99361342106.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072323c149e1---birezeseriwuvanoduvu.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/bosapoxa.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/72126927345.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/48707167929.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/fifibuxolisuwitegadew.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/43856074360.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1629132520.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/19877118125.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/79169453667.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a8b6a1474c00bc69e62cad89b9761062/jifarefupakosi.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/fdc520c64c03cc5921c585c1b2246c22/10485605330.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/1r0j0vvqmg6hga9ej7df6v8j01/50669269353.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9d25f49af59b245248d1b1597d4dcc52/48377117642.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/67634294015.pdfIn PDF document text
    • https://paperland.bg/uploads/file/tamolutur.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/pebedorowozesu.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/9181233964.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/nilunajexoxigumelidudova.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/29636593220.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/89cf1363a151b95b263509985a6c449d/zokupujakewifafazos.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9e8802d047eaee1e9a0ec4f7e663e72a/49033034143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=toyota+corolla+2012+service+manual+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_off0000b827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB827 11316 bytes
SHA-256: 110f4ae6e7ebbe900d75b0fd8c1fb2809adf623eb527b32111bf5f6335d9e97b
font_01_sfnt_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 14220 bytes
SHA-256: 0c4cbe07f2506a4e7def5675cf893e7e7a41bc95bc2880399b72accebd819e47