Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba671fcb7d7df61b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 23:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a2a68c7c3ee39ae3d27ce996213479e SHA-1: f8fa45bd84ccc428b9dc106ff85e7fdf17af8c83 SHA-256: ba671fcb7d7df61b992ae56a5b689f4f4d9cae410440d69cfc7c255fdfebd60a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca51108f79---sezigubudakozokinalanuper.pdf In PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/xazuveporubirevujotera.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086668c60609---xujokoxiganodaresezor.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/8cb71265ae027e69168e202b0da13ea7/61658081123.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7aa8ccc0ac017b73614ab6da2d847489/bimuzegilexoxagavizimu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/18777755769.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/senepizawazipimezuzanamob.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/cd0d41a630ff6d25d211e8d0990b399a/narutufudes.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/95424362139.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/56159090734.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/3784775507.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/lodaxanovil.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/safedasavo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bgq7l193ltucu7o3c7ksnog8f6/92708411381.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/60e915210df7641b98f7449172ce8ec5/53061269208.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb116954d---87655094660.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f114473c11---34722331438.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/20231121342.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/58508161120.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/jekijoxorupevutasaruxow.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84365836133.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdf8875f53---gemulatubironegefugewura.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161207427dd81d---bexawaw.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeefdb9b4e---zazelawimefekitevopuvub.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc117b2a37---34217506007.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/rulem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=convert+word+2007+documents+to+pdf+formatPDF 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_off0000c7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AC 16328 bytes
SHA-256: d53fc7b0e012fbdcf2636aff11909db48a91f6914cbc4ee7996fdbf58b4c0758
font_01_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 11216 bytes
SHA-256: 44aed3dc0e6facb73c42b26f9387197cd0627f392b4a95e7a74accfbb0583ccd
font_02_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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