Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d997d95e92045e…

MALICIOUS

PDF

98.6 KB Created: 2021-09-12 02:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6430ea6d3e083057376c8a7b842aadfd SHA-1: 3aadbcdc4a24e5939fec8144f1eae83b5318ee3d SHA-256: 19d997d95e92045e0699153921fd59aeec70f5ded50362c6a64ad028c03bcca5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tercovci.cz/files/file/vuzopivuvex.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/875a08a28283c3327d4a66a448754ec8/xisirisosepemul.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/40767202615.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/11895594078.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/joguxafu.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/vowetarolelewavazamur.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/jekowinarokol.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/255e82ee3b9903e8a82ad6ade79e5550/40749526811.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/58836112333.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a41a05db---ribawa.pdfIn PDF document text
    • https://nistd.in/userfiles/file/92837608182.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/57409093810.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/kazaxajazepiguf.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/6073063328.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b487a5a46a---reripuja.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/guzimovazokebufurubejomo.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/48573450391.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d14619584---40364130305.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/22890475099.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/88440539972.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1eec786f2---65330262798.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/nodajevofajuzo.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/78529273643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+10x+rule+book+freePDF 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_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 19088 bytes
SHA-256: 7cc709573e22dcc0278d0c7358837e8dea47b28a5b6b142d4c76d17ac87ac82e
font_01_sfnt_off00014d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4C 10256 bytes
SHA-256: 0f512b7be9ab58ae406a5fcfeaa3cc25e60ad552c178a5de3fede8f52eb6d690
font_02_sfnt_off00016484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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