Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2b50107d20a5db…

MALICIOUS

PDF

91.2 KB Created: 2021-08-09 04:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00e0df9b6f0cc95880c03e0ab6c09174 SHA-1: a21ab1759b2313265d937629534cfe14f3913811 SHA-256: 7f2b50107d20a5db73028318840ec8ba105214cdacbe2dc38adb64b8a33cada5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious destinations, likely for credential harvesting or further malware delivery.

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://crysiq.ru/uplcv?utm_term=new+bollywood+movies+mp3+songs+download+2021 PDF link annotation
    • http://activesolutionelectric.com/images/file/nixaduzo.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/duvoxigiteloxigere.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/511ad6c70c38cd6ad6fe26c5822442d3/29967693305.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/82752057355.pdfIn PDF document text
    • http://pasted-radio.de/web/files/voxegogiko.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/53398be56bca3657cfd1f127be5c8af5/votekixuxubenalit.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/xutijudefufixegajexori.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/60329671310.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/rexisewodisusud.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/5266586633.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e12b78aa---febasogenenadukun.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1851e9a7d1044ef8b2d5099fecb448d/kipinipalomopejenifexupez.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/m8n6ne0ar0nui3g8a0u0aknvko/52393991603.pdfIn PDF document text
    • http://coffee33.ru/archive/file/38877620860.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f390b8e22---rolejojedotitidegelob.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/22be6b80e4379a33e31def7f05e2c0d0/13190228982.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/tamalatifosudaxiwemil.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26e2711f20---wenozoravomesirod.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0d6b9cb440856670d4ebb97ea0a10447/defelegeva.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/jixawusupi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a9c6c65b---dokukipik.pdfIn PDF document text
    • https://ivanamihic.com//files/31594637491.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889d5667190---dejemuwadikuzaxaforurawin.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_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 11388 bytes
SHA-256: 082ed0361a1ce1a50426af8544e3d68464775f4e733a4cb60bdb2eec64b52e60
font_01_sfnt_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 17860 bytes
SHA-256: 0836c8842b4fd1a7fcc2d17760a79c5e9a47d1d7dd1e57cdbec2d22b8dda8867
font_02_sfnt_off000146d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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