Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fcb18e7bc8b819…

MALICIOUS

PDF

87.9 KB Created: 2021-07-26 23:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 028073864b4e3ccedbd1c1296cdfa8d3 SHA-1: 2b3ebd57853552b4229ac2f08ccc3aa48b4204a0 SHA-256: c5fcb18e7bc8b819d48734babe459716c06e46abea06e49233d50a2c081b345c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://namdolove.com/FileData/ckfinder/files/20210624_057F93ACE2D2DD5B.pdf In PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507120821357229.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbc577591---ramafumepatugedapof.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b35b4a19d---55554132593.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/kotanalixuwidufuxapala.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5d08qdcsfl890p6aa6fujd6oeu/xatujafepetuzafu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/sapawenigojem.pdfIn PDF document text
    • http://tao123.me/pro_pic/files/wodafawafi.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/16472425483.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/beef8feb9b8b378b72598215f59ba5fd/bupudadimakaz.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/39965275947.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/bidirer.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/77fb794a5469b0fc54ba2bbe2c97c289/15588394456.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/71640234251.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826ab51132e---38677769485.pdfIn PDF document text
    • https://parfumzone.ro/files/file/kidewesavedejisaxakidom.pdfIn PDF document text
    • http://yoron.net/up/files/dobotezap.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e88343740589f8ea39775dbea2bf5918/fafetazuv.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c5304e088df6c141a07c5d4fc9f4ce52/domogop.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4b10f048---roraxavumimojafaxufu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/742b6fc8a13ddbbaae7e3c4dad69c1ff/35943094551.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1127d98842b60de4167595c422dbfb16/bunepomab.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7528da539d4396a44ba7cdc601060bbf/32004973082.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160abe61829363---mekesifoxebudek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+pewdiepie%27s+net+worth+2021PDF 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_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 16548 bytes
SHA-256: 614c6f2ccc164d2ff70ba857be547f1498854e7f02a901678b6c05960e6e3a49
font_02_sfnt_off000137c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C6 10848 bytes
SHA-256: eff926eeb214c1350eafbb51f606c64ae3122b90bcbdc680270a25966835f1aa

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