Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fab483f0027d21e…

MALICIOUS

PDF

86.2 KB Created: 2021-07-16 10:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9bd0e8f4ccd7816f03194c3ab3720d8b SHA-1: 3d68cb80e7b56c5db8bfcebe68d7be5b8361cde3 SHA-256: 0fab483f0027d21e666611cc6f26924958086d653513e06159e4cce424dc9e8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afefdcd5d---rapijutamenufogamisi.pdf In PDF document text
    • http://armanetti.com/images/ragel.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3ef67a06f23cbe451084ed5d3bac2d21/daduwevekew.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/kolipudiro.pdfIn PDF document text
    • https://strechybenesov.cz/content/padugalovareborok.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/winaripivuterebekugato.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160752c80dc9b8---67592654304.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/sakeresavunepobawo.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/detamosanopivijifi.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/77364582198.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/83950105302.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e764dba61ae---3195754468.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccbb3a867---mabedodofe.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160854ab482108---fewor.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb3155029---tamupaduwugas.pdfIn PDF document text
    • https://songhong.info/userfiles/file/rutusewogagaderivixomab.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092dabf0f858---dipediwisovenad.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/83789793751.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/87946518633.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/35081029370.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/35e330265279c9ec65c72a2d12302067/rexakubowol.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd8844462d---biwikep.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sejonobilaf.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/29581052457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=letter+for+non+renewal+of+leasePDF 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_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 10156 bytes
SHA-256: 2e7fcf6c68dfb54a37e7b3a8662c1e14bf55026e874ae432a748f78062781763
font_02_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 17460 bytes
SHA-256: c306c76ba36a4ccdd40937b44c65b59347a8512a653abd429c5a9bd4a4e3056c