Malicious PDF — malware analysis report

Static analysis result for SHA-256 a058448936ea8106…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 20:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03fed61d37b2a5f54590529dcc9c11b5 SHA-1: 1bc7171eda104f6399b6aceaa68c85066db2269f SHA-256: a058448936ea81062afc44811797e4a0ab031d58738d958e30ef56e1a1941d44
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites and potentially malicious PDF files. Heuristics indicate this is a link farm designed to lure users to external resources, consistent with phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest 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://philabc.ru/uplcv?utm_term=texecom+veritas+r8+alarm+manual PDF link annotation
    • https://alves.bg/ckfinder/userfiles/files/ledazeluf.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/49347433036.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc992a05198---99804178719.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f669fedcbd---lufosepi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161094f306fd09---68591125549.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/36810010470.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/poxogaka.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/difubasalapipifajeboned.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a82bfa709ef---kukumukerize.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/digebimaxixukasezivotuke.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/suxibizasojirof.pdfIn PDF document text
    • https://activepymes.com/pub/file/70917750628.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/76915661589.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/6963955622.pdfIn PDF document text
    • https://soechi.com/userfiles/file/milupabolebagob.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae6b0580b---43893642238.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/81485050584.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec519c8c595---gukidisaxa.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/naforagesexowuzubazidete.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/40871862787.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56a29a475---wiradipapolujorulunedoz.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/sevexuniguvagibevig.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/34690426590.pdfIn PDF document text
    • https://dm288.com/slicice/file/dedejokesijodil.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_off0000c751.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC751 16792 bytes
font_01_sfnt_off0000df63.bin
56141d9a57796268886f726013f471f9ebf8ab43fe672bb5202b759fd2b7de65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 17068 bytes
font_02_sfnt_off00010b73.bin
f30dca77bf396fdea1cfc7f7a094be1550db0d7dab719a2fca192d8349cc5701		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 10832 bytes

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