Malicious PDF — malware analysis report

Static analysis result for SHA-256 158ca5207fc7ce05…

MALICIOUS

PDF

88.8 KB Created: 2021-07-20 03:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 073fef9cea10f4ed2772064c0de4a23c SHA-1: d975493796741c8a395798b9ecfdb5e8fe04b2dd SHA-256: 158ca5207fc7ce057a22535d6e36eeeddea2b20366e62e9a1d382fa632dec723
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The embedded URLs, such as http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66e66c631---29266278113.pdf, likely serve as lures for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ray-king67reunion.com/clients/41562/File/mekizefatezafota.pdf In PDF document text
    • http://kgmda.com/upload/files/tuzaridotazabuka.pdfIn PDF document text
    • https://actorconseil.com/files/file/puxowowosa.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1167a8f51a2cec05179bab5e75ecbe07/xawerixobiz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/79749dc384598f777e9b19f6a8976590/wesifibif.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/320466e5f4b28280ec80de68b6678181/pevoxidijadoxegiguwowez.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868ad6d7a03---dukewegitunu.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/6b5d7faef5484fe539429764c2de2664/jezozusugudatizulek.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/30abb81683d31fa82f5de2d21278d472/togoxidavajusixabilo.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/neturolivufadebevagovojok.pdfIn PDF document text
    • https://triosms.com/userfiles/file/45798528628.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/govowomorikamepaputalebu.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/95605247155.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/356c06774c329195635f88ed80107523/46198289433.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/kusoxurogubejomakubar.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/59022539493.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aacb6cd63c1---xaxogigutewonegefutex.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d9b911a1---dujakaxewajefarirud.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/972a020148fade4326afdde0bfc53d99/18201942962.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/6327748586.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e90f49cb9e---26375026601.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/54573553534.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66e66c631---29266278113.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b95bf5ea0b6804fd9f78bd11068bd7d/57543075408.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/75h0etv18ktomtf2vgeigkeub3/30079674048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=an+electronic+spreadsheet+used+for+storing+organizing+and+manipulating+dataPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 11208 bytes
SHA-256: 45e23d67b03b0a8a6944fe7148474d0850511ab28d5f7ec9bc59f24cba1faade
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16928 bytes
SHA-256: dcb8b9937f3e6d31638b6700913ee17a706710c5e9993d186b87da38dda31faf
font_03_sfnt_off00014c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2F 1724 bytes
SHA-256: a02a639d3d1b932fe9e9bcd48e954cada2f7b5728164d8cc8d12af5f67379482

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