Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab724bb99dbe9ce…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 23:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b4cf25ce7d298cc57b40d0d5e9dd0e2 SHA-1: 6789f75d7442a0d31ba8084ac7a9b45c8340b700 SHA-256: 8ab724bb99dbe9ce20523f75b972ddfee2ff2ef7471f15d1407ab2ed55d171d2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware distribution. The presence of multiple links on compromised infrastructure suggests a campaign to distribute malicious content.

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 https://samsungklimalar.com/upload/ckfinder/files/fuwukiro.pdf In PDF document text
    • http://craft-personal.de/userfiles/file/fotawa.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/43753948324.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/85612274115.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/r69bbqh6ketth398dbepktqd71/detavugurigitokotef.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nimimigixixigijabumezupo.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/51597465925.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/pafurotezivupubupaleva.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///gitedukanaroxodot.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/zoboxagujijufuzudimixut.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/84508389623.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/gomewosagur.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/39292141595.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/nkb0s0j5jjeqn5kpo8nbl1eqau/vugarojexenefit.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/molezezujinupaburomi.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/85570039389.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/nufiguziwu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/kf7iviknnksa84cbbdudis0k77/71353032985.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/77816696366.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/255e82ee3b9903e8a82ad6ade79e5550/40749526811.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/vaginefaxad.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/zaxipilenudiluvimurenod.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/xipobajunuvisa.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0b17a86b6d167a568af66c0ba109931c/tesomanatoluxovux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fire+tablet+chromePDF 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_off0000bf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3D 16420 bytes
SHA-256: 1a69b557bccd8607bf39a75eb2edac21d78a9a74312b4819935cb6274a4651ed
font_01_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 10340 bytes
SHA-256: b0ac042caaf53c1b9f88280b6ab712d304b39510a4412c405a4430f7e79d6691
font_02_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1