Malicious PDF — malware analysis report

Static analysis result for SHA-256 2979d5859095fb50…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 14:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 82f65bcd4b85b2929aa97dd67fb4afc7 SHA-1: 5957adf103d58431cd8303ab5441637507e86035 SHA-256: 2979d5859095fb50e7eade56ac76fa3599b9342739ce934c64bfcb2d0ae5947e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=britten+the+young+person%27s+guide+to+the+orchestra+instruments PDF link annotation
    • https://fokusmedia.com/images/uploads/65601586820.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/muruzixedi.pdfIn PDF document text
    • http://dgjst.com/upfile/file/gumizesaridozijegevup.pdfIn PDF document text
    • http://decalvanphong.com/img_duhoc/files/6216927232.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dn479ugelgkq1uoltvq6sua104/pezix.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/35423921960.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nc788bb1q65tfj1v6md5i4n8r3/binajibur.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad349d87866---19243967847.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/wepuvidelokewoluguvowudil.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/42800662096.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0d98d6ea6cee7fe64bb9408e4fc21b4c/jitegijuxaduforagevosej.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ecbeabf3e---luruxugidegopawudukaseram.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/79352050212.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fe080e66093d08f9c0ac0559810c87e3/89954445676.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/qfs057nmefgvkj8s9nm464br7d/falowatorilupowevudo.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/60586728801.pdfIn PDF document text
    • http://alkanboya.com/files/file///62479827111.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/9fjbc16h7aj5mjas23dh0tfcgd/76881130900.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a7b57941007a94b0dececae2fae6f9de/nofuket.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/41532303260.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/20013909359.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/92911749765.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4aa5529ed0---ruvoso.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9af9666b0265d86902d48c87f90fd41f/tiwifozisodenirizuleni.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_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 11216 bytes
SHA-256: 87b83ae991898189a1aa55c73a82ac2048d9e5dcdb7107c04cc52049304d43c5
font_02_sfnt_off0001192b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192B 17508 bytes
SHA-256: 86fa3248bbe641cadb191f973ce8ed3517c859c270e3b153920dc6c38ca6344e

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