Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8a2e07da4ac4ee…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 04:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 0c95db8164267f874a8a3ff739ac230e SHA-1: f6957bbccc9c124adf4523fabe335319ba98fa69 SHA-256: 3d8a2e07da4ac4ee704054b2a60f95728e1e246910e7527594a0ca212910e159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=libros+de+dermatologia+veterinaria+pdf PDF link annotation
    • http://aaaexpressac.com/userfiles/file/52450378386.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7e6c08e31---zekusipim.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608804f2bee4c---73084333935.pdfIn PDF document text
    • https://maviet.vn/upload/files/70982649678.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/mazujeposulazofewarino.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/43334868806.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/26061634983.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/wenobitonekakufuraz.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3cmg96boe9rc2sakegbig814bs/7334705446.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/jorosofiraxunagofikuvifu.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/mikusululazudobekerikimos.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/65834823483.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a6dc14b517f0eea9cce2282f677d2182/70154231572.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e447ee25---13234538846.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/julejamugawofowi.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/44418280287.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4987676b300f98d38c802ebc6e0e4dcd/vipipu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b33987eb---15024232060.pdfIn PDF document text
    • http://surtek.biz/image/files/20150208_014105.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/nizoxoduperutojub.pdfIn PDF document text
    • http://email-database.info/userfiles/file/23825233222.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/98979097992.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/gudomide.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/91c2ppbse9ce0p442v53nv94sn/12483774882.pdfIn PDF document text
    • 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_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 11004 bytes
SHA-256: 736966149cb72ea44dbdec6a44a3c2746acb91ed371e0a3948ad008073b89e43
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 20932 bytes
SHA-256: 5bd4818a1dc727fecfdff3b4f2a4d2c23fbc27d6aace3327bbed221b1e662d9a
font_02_sfnt_off00012694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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