Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bbef5037ca30d6…

MALICIOUS

PDF

83.0 KB Created: 2021-10-14 05:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e24183f2b633bee64e862042e39b9eea SHA-1: 3f923ab16f5db35ee2fb6e931259f4ea25f2bb32 SHA-256: 84bbef5037ca30d6a2ae54ee53eb8b974c3c4a3029f164176e46c3472027ee8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the extensive URL redirection points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=forward+and+backward+chaining+in+expert+system PDF link annotation
    • http://polishingmarblefloor.it/userfiles/files/38893084498.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c85723212781dd53a6bfe065a0021789/82890262887.pdfIn PDF document text
    • http://ruihuitax.com/files/file/lefovipewob.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/7144552389.pdfIn PDF document text
    • http://salt17.com/userfiles/files/gofateraxudubebikuwizojo.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/50423324333.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/64051279810.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/malezokawigabejilofisekar.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f7f2da0e70396fa1ac2abf8abcb36dc8/pegakudu.pdfIn PDF document text
    • https://faceless.me/userfiles/files/sowomumonijava.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7be0f903---30506436598.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac660d4a04---vuvoxab.pdfIn PDF document text
    • http://jsdarvin.com/files/wiginuvikijazuf.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/31209865255.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/vomepesavitopovijukiwamu.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/buxajuvukazigaledazizusu.pdfIn PDF document text
    • https://basisnomor.com/contents/files/femovisazulogegoxesinazes.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/38868154894.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134303bf3627---72787611515.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/86152241554.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/85989348334.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/6406676762.pdfIn PDF document text
    • 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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 18528 bytes
SHA-256: 6331c4627bbe9124c991066c02761d5acda73a1d7dcef62f8fad799968b04d8c
font_01_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 11428 bytes
SHA-256: ed2ea3da169bd8009d443fbdc4f2939188da0f59b7de11ca124da71fc0dd7fca
font_02_sfnt_off000125e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1