Malicious PDF — malware analysis report

Static analysis result for SHA-256 412741b4743d5204…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 10:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c36fca14e46abaee06b28852cc9d4270 SHA-1: 9d2c851c9d829db1fa0c85af5bf5f039d40422e6 SHA-256: 412741b4743d52040f22286b050e5562dec4bb092678fb6ef7d221404523edcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm directing users to multiple compromised WordPress sites, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ahreco.com/uploads/news_file/revobefewunetodivagazet.pdf In PDF document text
    • https://haysalon.com/public_html/userfiles/file/paduxik.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/82e6aa7748695054524accc402353020/27594771267.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/68913535196.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b0ef30a10---fuwabevomezixenifikoki.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/zunoziwodazotedorulux.pdfIn PDF document text
    • http://capital96.com/userfiles/file/kegawipuju.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/jovesilusopuxiriv.pdfIn PDF document text
    • http://anindecor.pl/files/file/53834433365.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/63447867564.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/7523483683.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b55bc6cbc---69343113349.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/91692097755.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bbca8cf72---10810364544.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/nonemilomomadom.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec729bacf2---pizidovirifajuwik.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3a845d8ad05fc0441589bc2bb9c1f02e/48678094260.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/34220087279.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824ede85776---bipibaronepevofelixifiluv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b31a77653c---ropolomimugevo.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/96133671276.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/bisiva.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/61885149993.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/24080425335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bma+handbook+of+mathematics+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_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 17312 bytes
SHA-256: 21dbdfba7a50a6789ba42f65484ad84af07acd600dfa3285ef1e2c5272110d78
font_02_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 11024 bytes
SHA-256: 3abfbe7ff26b29d9cb3a3059a0ce4b3f2ef1d68843c5a544ea0f98f03cf86c18

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