Malicious PDF — malware analysis report

Static analysis result for SHA-256 f263552cad3f6bee…

MALICIOUS

PDF

89.2 KB Created: 2021-06-26 06:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c9a57375ca98d2673d78d3f9f9ddb2a1 SHA-1: 931407ed8d557943034e4969f7d7cf5048cf6d1a SHA-256: f263552cad3f6bee4b57b0ab1aad3629118fa766fcf3a866eaa138e74ab18dbd
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 compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs are consistent with a malicious document designed to lure users to external, potentially harmful, sites.

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/q9kilbik1ea0tuseu1u958nhb7/butukubajigakarozoxiropi.pdf In PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/aee74914c5159d3efec14f0fa9996c16/73553819644.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd1925690---5241273658.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7fa4b325---pevusavamaworuvulurapuz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb13116097---mubup.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/vhkr62qk7drklshl9gk579cm32/54755640316.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2da9qiqmrdjv5mhrts4dteg373/71318996085.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8dmle2l11fksbhclq3pi734jo4/61514415119.pdfIn PDF document text
    • https://beliangka.com/contents//files/63981208824.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/11574356166.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/23111435352.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/paduragegirinuvevugudo.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a0b98f29b974c963b7de60c6a00b253f/zabifewozosidag.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ef7bab55af7aec024b043a1891fbbcbd/46945929572.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/bfc66c3bd60a670d2d37d21c6321b8eb/nakoviku.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nesosorosake.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/8mi547n034uns4kq7g1fcmmsf1/wanujobidateja.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085301af2c18---19994070287.pdfIn PDF document text
    • http://fructusartis.com/i/File/59527839806.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mjapsqceq2g21hkvenvu6hvhu9/40620455354.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c430f4ae58e---vukimewelulazinafula.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/lovotibabug.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3f1sg5ct89v213m739q045v79n/pabawigeganejeji.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/pagugajepikago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+will+i+know+if+my+waters+have+brokenPDF 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_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 17320 bytes
SHA-256: fa23353236f0a5c560440a52180f5a06443a74c650c36c96d5a32b6fa9dac91f
font_01_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C63 10968 bytes
SHA-256: b1c2bad21c0e7ff1933729bc86d58c07701811df7750ed064d6cd72fa7d49577