Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7a0f923806de2b…

MALICIOUS

PDF

87.3 KB Created: 2021-07-09 08:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b822d0ffe3a4a10945de155035e96d99 SHA-1: 16abf2bd8ec8975d2761f0d02918e73d9b53b448 SHA-256: fd7a0f923806de2b1f71ac534550c9e0504fe074a2dda389b6dfee10aa4328a9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities to redirect users to malicious content.

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://pixomot.ru/uplcv?utm_term=your+services+are+no+longer+required
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e4b66aa2---gofokedisejekizi.pdf
    • http://wsp.pl/userfiles/file/viwagawi.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gqff1vdo729kq3bqil150utji2/57292332558.pdf
    • http://tv-sat.cz/userfiles/file/77633498363.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210704030646.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/momilagugavoneko.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9226aa5ab---48752267752.pdf
    • https://beautyyaurient.com/editor_upload/file/35709930742.pdf
    • https://akapacha.com/userfiles/file/88679461396.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5341d97c---24772287028.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4460cd441c594b7cadf4ed9d754109f7/texivowon.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/u4ablqvoemj5s416do5fij7a60/39905736653.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ape35chbvngv05kvaugse5m4ln/22177734469.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6be127e16c---lukununewuwalewulab.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c3873db2fe0b5f29ec7d11688b0b71e6/kanatuwinaro.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a377a9dc21320411277db5ae9fa445ba/94336976075.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c39233d05309c69e723758b315e08550/72491777525.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/supesesetisumokab.pdf
    • http://freeski.hu/freeski/file/xurogogorunapejina.pdf
    • http://tznjl.com/userfiles/files/65924239917.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3b121176---jideporiranoko.pdf
    • http://aaaexpressac.com/userfiles/file/bojivekebemulizezowad.pdf
    • http://etcad.net/np/upfile/file/paguperatuzomimupevupozuz.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/19b51e313b140587957ec47d3a8a5789/2814074402.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f326.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 16792 bytes
font_01_sfnt_off00010b38.bin
c8cdea76fe5fe27c97085f18d78aa13c59b7b0a01b1c1569ed297ed3e0b83403
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 17032 bytes
font_02_sfnt_off000137c8.bin
632333f42032e99a368fdb23c816ae251d411b7098e64a47d00b526785600172
pdf-font-stream PDF embedded font (sfnt) at offset 0x137C8 10740 bytes