Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb9cb2178928355…

MALICIOUS

PDF

76.4 KB Created: 2021-09-02 20:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84597d9e4e13444764940d530543d19d SHA-1: 5331c367e216c0c186650056c1e18f169c9e28be SHA-256: bdb9cb217892835534bc2f44879093d0a3aa98a441c658139ff077943868690e
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 of which point to compromised WordPress installations. This behavior is characteristic of a link farm used to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b8e2a16df---bunitopufesepugixel.pdf In PDF document text
    • http://melabo.com/upload/files/vakimobivozorugazarilo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41468fa14---bedagoga.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/72562391881.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/92959232914.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/28592276738.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5e06e7ee42e85462a9b57b6b184a182b/damofilusatudiwo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/zovedazi.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/wokalanovugumiwilef.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d6ec1a82---93680725739.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfb3fa0312---fumima.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/05b35b1ff1c7fa7fd21fb199c99dedad/76099408719.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/afbd927e26d7a1144eca14708df1f1db/fupudolidarebav.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/tadikevejejudekobukonogo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef21985640---37635312472.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/8945525599.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54e19e466---nunurapomu.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/nikibezogunoret.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b174b763b20---pakowuzutog.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160862b6e4d281---8291244517.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ed6oouucdhd32dh2hsbpijfl47/rolimixazobidevakupigapud.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/018d10e465077b5051eaf4da1c44a3da/pubiwuxajigufesopagoveni.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/zusijogenobusepedupoxina.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c97b5f2a2d7f0953b003b33147fa48de/lukojumujesotoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=etiology+of+community+acquired+pneumonia+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_off0000c79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 16468 bytes
SHA-256: ac02309046e193813021e7ed995502816825dd40febf5aefad10ebd7b2315e3e
font_01_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 11140 bytes
SHA-256: f893fd4fb7b8c8c0b6da13dbdcf4114ba9d2fabe22aeedb6d944b8470564258c