Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86c57511241cf2a…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 02:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54d74b992d1f384bfc982fb00d79ef7b SHA-1: d6de3c004d9d33a4dfb6ea47dc3fb8338552a2fb SHA-256: b86c57511241cf2a04ed06209cadce2396722b16ee5285e5473ab02fe659a25a
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to compromised WordPress installations and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The primary attack vector appears to be a malicious attachment delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22f2c9dc37---33951381112.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/34e2fcf582190d528bed8a18d98934ab/vidazofogisifajepe.pdf
    • http://pwmtqatar.net/userfiles/file/sudimovokumijojakemo.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5dbaf7c620477b77106258212a4318a/52499553538.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7ef227ecb7e078e2bdf2d5101967b92e/ribafugotikopepaviva.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e8b66bd6b---temulobeloxibab.pdf
    • https://motty-etai-sharon.com/files/files/83607980011.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b8392a6f---87850754451.pdf
    • http://goodwill.pl/userfiles/file/vopavejajedunoreg.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ded745d88---zesibas.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5051d910ca---bewemulavejimu.pdf
    • http://chinajnbt.com/images/upload/File/jumeledabusudepibeguvoduv.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/04npmssarnfvp4v0fdt4166p4g/5775078124.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3afb73e0ea---gusonazazowiwiw.pdf
    • https://ebooksweb.net/files/file/nobifokiw.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c4cc148d---xiziwisalutigoluzeluro.pdf
    • http://abnicum.com/files/file/80547268882.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5634f5df---foxedaladamu.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d7831cec---nokivowizi.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0ba47afe84c03bcd6769af10636b70e6/34184323469.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60b358bda---gipapiruzepupetudiko.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b197600b912f3aa4bc60f05862a115c8/96404560319.pdf
    • http://crosswaysrecruitment.com/userfiles/file/365926546.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b46bf88ffe9---vedolumulol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fathers+house+pastor
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0b2146616ade1323458b9aae5521f965/zemimale.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdb.bin
4d49db6e50b52d3cacd42eec98fbc1a5adc4bcec6c6a8418000c4f5d4d7d03d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 17088 bytes
font_01_sfnt_off000117f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 16792 bytes
font_02_sfnt_off00013009.bin
ef4fe514c569dd94330f13cb8fa3c1277b02e7360f84506518ad5c8ad59ec216
pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 10184 bytes