Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f233ed243174df8…

MALICIOUS

PDF

93.1 KB Created: 2021-07-06 19:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 21628a8ea6beb47188eb420f62863216 SHA-1: 2bdcea3006d310af7f4f63a31a2dfd7086b1d388 SHA-256: 1f233ed243174df887c1b5e8b4790cef2f156820e0e43f7888cbb86d35b62d7f
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to multiple compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves tricking users into clicking links that lead to malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://spheresignal.com/app/webroot/userfiles/files/sosewudegivomabipowapin.pdf In PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/tosezoriwo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c07426150a2e1758c8dbe89037cbe362/vatapexonaxarerevo.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/36141004374.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/56172515980.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cee42ed41ff846879487c25a57907339/lobimevuroro.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fa140e940bccaca37cb63bd274e3f8f3/firisabetuxoguv.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8696471194---ninodesubinoki.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/24e62a181d7507013dac77cf4cb111cd/7131428852.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/9ivo6087l77mtllvvahmcb1170/vuzususigilamere.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1057aa3db---kinazawuwezarajekevopini.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/rmbam7mio07jkiuosdodudr9f8/gepurewufowabu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9103c642d---wugovepudisiluzawepewabi.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///vogulowupowena.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89616795163.pdfIn PDF document text
    • https://edarky.net/data/file/45451483491.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/pobunewewizozi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c3210103b---30604196000.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba845feeb62---85485409523.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/61340746085.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/e98cb11cb35df83949faa65e3363df1c/81724203680.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/wuxaroravesufofidej.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/vukaledogi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5aaab7d3e---67108589880.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/kimula.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jrr1smdhf76cal1n2jui95nfi3/weseverekilokowanapuveli.pdfIn PDF document text
    • https://basisnomor.com/contents//files/fonalawot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=coffee+and+digestionPDF 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_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 10412 bytes
SHA-256: ec3ea01579b340a094ae9fef73bf86bfd65f266526a74d2583bc07f0f0b9b57f
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 16508 bytes
SHA-256: 769942884e4d381c394e19081ee48897751ba3127cc30a320accb1ac0b98b9ef
font_02_sfnt_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 17252 bytes
SHA-256: c43cce3c815b533b62e9f7163bca9654ea2bea902d475714780810c5be0c5180
font_03_sfnt_off00014e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1