Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbcaf993f55f4ca…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 08:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 378b0c14e7dc487a9e320291066eaa0e SHA-1: d7b844eb2b3c1412b182f99cbeb9f2b75d98ae45 SHA-256: 3bbcaf993f55f4ca47698e707e1e38ddf55a9bcbae2c6bdc7e19d30c3fb64fd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pecsikult.hu/files/file/pavopizavenofaxo.pdf In PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/mavopibofomuxinawapekud.pdfIn PDF document text
    • https://digiconelectronics.com/media/1082469091.pdfIn PDF document text
    • https://eklyps.net/images/file/kajezizuvowigajik.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/sesuvugogif.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/somafukevapewamowotag.pdfIn PDF document text
    • http://whatdwellswithin.com/file/7817009885.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/94599187725.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/63587929141.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/dufomexax.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/mugusuwuburuvamafibefefes.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614091fad185d---denoxidulojijanidu.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/12605296325.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138058900182---72567766664.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/noxaj.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/50389891265.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/bodijizurudafizedini.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/gifalodumural.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/jefum.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/30362207253.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c693df1e204c904e8bc79e2a0b4f5887/71963354163.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/76849571832.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc72069924---72562968822.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135092dcbd12---xaposudaluxexixowinabusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+friends+and+influence+people+free+pdfPDF 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_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 11052 bytes
SHA-256: 9655e58e12ea9d7d2457bf6900decff6fee00545ef968ef01a1ab3046e068d32
font_02_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 18444 bytes
SHA-256: 6594df5cf1acc124d9962b5e06464e5317732799713e2605a8600e3efe0c8aeb

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