Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4443b7b791e7f4b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 20:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d2b0aaff840c726517339e1e31b02e18 SHA-1: 1a16cac6ae9f47a1b67a7b1ef08b9e9998265584 SHA-256: d4443b7b791e7f4bb16e54b6ffa33de739698c86a8cab55c676163091a1d2c01
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and potentially malicious PDF files. Heuristics indicate it functions as a link farm, likely intended to lure users to malicious content or phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100b85c823bf---87199877267.pdf In PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895a3648cdc---bevarofu.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/76870647762.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/jukugiwa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6334d126ecec3b2c9c6a5b43d04d2444/27260278477.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890e8042580---25823188008.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062814125191.pdfIn PDF document text
    • http://shamayachts.com/upload/file/mowobazifidinebasimixevas.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1d1cdea0---labonipowen.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed57a0abff---fozozuzekejutelimin.pdfIn PDF document text
    • http://soles2walk.cz/data/file/80740474377.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8121c6a8---21444648030.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mibisikedexogevijo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9bf1983b0af87cc5ae359ea3d4ed3394/tuwoxulitigitonamaxasopi.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/zatawitosimewik.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/44458633039.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/pobaxepulategezukewasafa.pdfIn PDF document text
    • https://hearing-outlet.com/uploads//files/202108071333457683.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/29906490102.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/fajuz.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/vogeloxad.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e92c733187---gabaxokomuguvib.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/66780802055.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609215d7d2b02---rebozitijefeduva.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/4605226865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=slam+book+questions+without+answer+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_off0000bf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 17176 bytes
SHA-256: ab52a511197f3bcea438c6d38b367fbd69636c6aa6d683bcd521cdaa8d88026d
font_02_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 11404 bytes
SHA-256: eccbd9c64f0afdc565712592ce509b6014b16aaa7acf085f16e4aca8d38de492