Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7076fc7c5c503a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 02:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03ef266e85acbed3a75e0dd38567dca0 SHA-1: 0f77b572afd1cd8e26d65c14e92a36004c51f39a SHA-256: bd7076fc7c5c503ae53d39eb3b25702f631f8c6295bd90aa8313a9fed32f84d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/abf0c310ac933bcec1759dc847962108/39014822428.pdf In PDF document text
    • https://zoorichi.com/temp/fckeditor/file/notupibu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/46909337090.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc63b03aea---33728854315.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/74298828894.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607af4ff3af0a---16488907018.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/52424887002.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0873aabdc82a6068fd7ffb7f31fc6a9a/48489132684.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/961bda743e03495c3e5d7d9c337937a8/12396424911.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/32159642670.pdfIn PDF document text
    • https://penal-garazh.ru/files/toriwivowe.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a1e5ec4c36e39530112882fbd2f5bd8a/mebubimegumukokujode.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/291901066.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/poforububiwirut.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/64920291142.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xitoxofozitoliva.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/tuwupi.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/17240932925.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/32112058587.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/cp38n39k0le4960r9kn8m9jmi8/70678068772.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/pomazoxunatab.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161274a2df2344---25962585205.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/23033703743.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/76311854360.pdfIn PDF document text
    • http://short-story.ru/upload/file/21027896151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+ant+and+the+dove+comprehension+questions+and+answersPDF 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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 16276 bytes
SHA-256: 77517b619d3a851619081f4f7efe04db63cce13bcbdf6d463fd2619dac4c6c36
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 11096 bytes
SHA-256: bddee466a20fa0670e9aca68a1ab92e18b2965c59001d9c94ad2801e113787f1
font_02_sfnt_off000121fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1