Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b10c6eb060c0f3…

MALICIOUS

PDF

100.5 KB Created: 2021-09-01 23:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3d9a7a84c290c6a6badb43ed7fbf6107 SHA-1: f07d4ead07077af73fd14de49a0a17591b406deb SHA-256: c6b10c6eb060c0f32b861ed319b4a657b69164dc5f01b4d993a4dee4d59da833
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160875f93972c7---pirapij.pdf In PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d7b845a8aa0e850c993a7fe03ae17e69/bugokijufiton.pdfIn PDF document text
    • https://luminex.pl/upload/file/badinufetoferejisudik.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c07c758548942c6e2f63aea47d49a3e4/pufinapaxotokisaxozu.pdfIn PDF document text
    • https://fptica.ru/images/file/8205422422.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160eff09878e63---84222814526.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/345120599.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc9d68882---simufakamewofo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4e0851c69---fetebasedijilorawajaluk.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/89698686113.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b456ff52---79393295307.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2ce3b106abee122c88b6afbc5b88722c/jaxufi.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/wifalofakanenusedimuvo.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/viwavazogedevapodujisugo.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/kunupazuja.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/bp3lbar9o5vvcdrgps1mi05ccb/18994593047.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/601697513.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610c58f3a088a---fomivekimopil.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/27755035051.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/rusudajamukederot.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/rabexa.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/dab4f1ddf7eef3c78001cac9f725a5b9/tukofotimijo.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/zaxirabamuteluwexako.pdfIn PDF document text
    • http://www.77ice.com/upload/files/49616548002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=calories+of+black+olivesPDF 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_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 16820 bytes
SHA-256: 5a52d44ae7293e2619db117e3f63c0be0b78ba568f7168f2e2aacad89bcf35de
font_01_sfnt_off00015342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B59 10456 bytes
SHA-256: 2e39c666c9dc6f2331e6b3587b44d02be497ea2d721b91a4516a02027ca7e96f