Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f36121952ecb116…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 18:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 16aac487b3685d9e446454f0d2c431ac SHA-1: 2143710c04897eab4553ca6b1249d713a94b3798 SHA-256: 5f36121952ecb116e516dd85b8ba218d2b9f524df18d779fcf8e484f439d15c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of these links and the overall heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cbd4ab9efa9eac3015d20d7fa747d492/95254895790.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9776d22a---nunopisoj.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/87792910522.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/sikitepofuponebo.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/bojujonijurumax.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/sixikagijoxutizovaxas.pdfIn PDF document text
    • https://suruburi.net/mm/file/2992661223.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/93434537868.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f4311292ff657e74393f7b403c15bcba/noradepifake.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/33799480573.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bdd62dc73---rigomivid.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/45944767928.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/49054948577.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613748fc91e58---94333168605.pdfIn PDF document text
    • http://herve-coiffure.ci/files/bunijagesagu.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/viwisavusedod.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/13377688338.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kavidiwogonibatozoxipus.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/bijiwijemubipa.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/rukefuketule.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/7331647957.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46526f203---58371199723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+last+survivor+apkPDF 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_off0000cfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB8 10468 bytes
SHA-256: 229b56574ec877d52c7136370ab06cc70900d1100425608cf44f3639d7366816
font_01_sfnt_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 17540 bytes
SHA-256: 0d29d53b1c0b4e10a9008ac629a0345f0b06595dba78d66fcc1d025baef5a842
font_02_sfnt_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1