Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb603179e6f8e60…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 18:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b934888ecf5e96965841dd8d078e2fbb SHA-1: eb8698fba7126b84022738f6bbb52727f04a544d SHA-256: cbb603179e6f8e60850af3a64eadd8d6d9037f279d74a66ec6e04be95dbdd49c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites using the formcraft plugin for file uploads. This structure strongly suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090254638373---78197927653.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111953fcb3a9---jilobonumuwo.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946305aeae9---sazodev.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/xuvov.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/41163134053.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jetajutawavigasi.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/96940596075.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/vemegevijubovilor.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7b210ed3a0f8861199a7fb9db3d44b67/60534346056.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608668e7c63ef---gonevufub.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/52031176688.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608750e737a73---12975912390.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/86088090107.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/wixizewize.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ceab1672c---sugomejofomuruwujaj.pdfIn PDF document text
    • http://mextro.de/upload/files/lajonijor.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/kodufejujapovelazofez.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/48171076454.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vh1e61kcceeh0vvso9c2corkb7/tijija.pdfIn PDF document text
    • http://c-amc.com/upload/files/wezokavinifujuzonesore.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zonuxepulovibe.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7565f04f04---zemoro.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/46911108897.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3c199a187b5b02f020ea2374a651805/wuzekewutiwofevozifinozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=numeros+cardinales+en+ingles+del+0+al+100+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_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 11116 bytes
SHA-256: 2ecbc8e82d9577d84073fdb42ad9c7e2650caccf71bfc1f2ddd48196d2d285ea
font_02_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 17896 bytes
SHA-256: 3d564d6fb8721d564865c17e5d7c1a9621ace74b5b0eb722fc4edddf23eeba51