Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d251b84f2f5a86…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 13:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 403ed11a1e12386833ff301dd8e9de4a SHA-1: 824bbce75688090ebd7df7874b151f488765cbe3 SHA-256: 41d251b84f2f5a8638f218ef15523c4366db5f219c03f39930474b8e8ce78e2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hanasushimenifee.com/uploads/files/33262834430.pdf In PDF document text
    • http://ty-universe.com/image/files/20210623_040853.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/39835259240.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/919469057.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/tazulatanefosewobipitosub.pdfIn PDF document text
    • http://boxethai38.com/upload/file/35854469250.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7f4fa436a7d91886564c6e4c6cd9a6a0/xasuvojiwirajekokijadosaw.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7b1e21f26ed121add20eddd796decfea/rurivisixemuge.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/lufukusowobutewimawudixez.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/36039954085.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/tiroto.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/79716677989.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/84253088532.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/libinupazowutamad.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/ralalolelipaxe.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/80919508141.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/6383790490.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/xonajuratex.pdfIn PDF document text
    • https://hinaweb.com/upload/file/vulukidetigedavevuxodeke.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2568d6ba03a9a0fd1c6ac2ebef2b8521/20496339788.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/bbb89efc93aec065b281a895688b97bc/junowezafanasujilowun.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c3cd7931fafbaa3798695b0927fb5812/timebalamoxivunuxiduxuko.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/2968797172.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/71778273235.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///luwajikam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nuclear+power+plant+pdf+filePDF 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_off0000c048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 17788 bytes
SHA-256: c68ad11746d4171af01e7a542a6583f5a856855966940e3f0eb8335d71c9c3ea
font_02_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 10608 bytes
SHA-256: c1ada22aee09a5a5b8f071e05d5eb3f7c115750cc0d0c9909b636e07ee20b2c4

Open this report in the interactive analyzer, or submit your own file for analysis.