Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ee9f3513ba87ff…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 03:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11973a2fdd36d5c180f5bcb403f5105e SHA-1: 599bfb23dfe53bf73deebb1fe56b6ca3b342834f SHA-256: f6ee9f3513ba87ff22edbe043e59166d1bf6574b4ef2073badf0eab439c3ace4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, redirecting to various domains, some of which are hosted on compromised CMS uploads. The presence of these links suggests the PDF is intended to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=electron+gain+enthalpy+meaning PDF link annotation
    • http://canadapremiumlubes.com/survey/userfiles/files/74174044428.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/cb074d32b20f49a7d0dcc69e2226ce42/kigorafeluzarizekivifefag.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/rerunukogokoxorukupi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/82858206509.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c83be2c844---xuxekogezuwurudedizok.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1978d434a9b7e1a9bd844a5d699f468b/wakojilu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/1701834938.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210722185244.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/leletapurupida.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/gijovupiwoxotewe.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pemokepapufud.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf520c5838---50826453084.pdfIn PDF document text
    • http://aurora-c.jp/files/files/jibijajupewikegadunifog.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/25491707823.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/2df35c0411f2b3e850324df3b2567e6d/selesogitex.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/juzepurukenu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/9avq1ll760nupj2j2iqp9e2522/disajojesi.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/33129319738.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/63071997902.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/watonakigaximukora.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092ccf1a0d26---41541828651.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f585ae22a3d637d34e183aaf626e11e2/66588456435.pdfIn PDF document text
    • 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_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 18568 bytes
SHA-256: 4f6f4e8c846988d6ffcb89eee677e5d13490fe6fe391c30f54dbfbe6982a0423
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 10748 bytes
SHA-256: 0812bd048392d7575bab492603b2f9eb8d9bf70a26de5faf924441dae8426761

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