Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfa2662506a87e3…

MALICIOUS

PDF

86.1 KB Created: 2021-07-15 21:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 580d65032832101512759b1aea26924c SHA-1: cf48d80006d1e4d1500dbc518b1ceac172ee76f5 SHA-256: bbfa2662506a87e384705f70f292b8a0c8af69dbe8f7e6d533835afdc85d8b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=data+protection+audit+manual PDF link annotation
    • https://viscom.bg/uploads/wysiwyg/files/89785339504.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/44609d603ff47e86aff9afc0f5f0b516/88012759235.pdfIn PDF document text
    • http://ozari-ua.com/files/file/kevodesifimaduweto.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf00f6246fb---jiganumet.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/be734a32698bd84068e0a94d305513ea/dakalop.pdfIn PDF document text
    • http://fedoro.ru/upload/file/sabezuvidotetidoji.pdfIn PDF document text
    • http://blackwingsexpress.com/upload/userfiles/files/86046575331.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/rewixazixanizumujebujoru.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/32787831843.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/fugakikilitemokadufexani.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/25365506560.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/jusobapotuwiviwokused.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a7c5dd77---3852750081.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2199909e---59515762816.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/575brstsq7dli3bvs6qg1kfrv7/vewewanisimuv.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090314bca41d---darovukurobidakigewewa.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/19916086954.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210610121437_gmh0rb.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kumiputowoseje.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/43057277741.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f48f58849ba13b8add752eb6334f55f0/xefaxafexurilinowonejewev.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/aa5e301cb25e98e519ed5ff81e61233a/mubune.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_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 10608 bytes
SHA-256: f6de94c0d80ba1e3b1f764acbe827ce1790be12810c60e15fcbe68ee21723345
font_01_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 17048 bytes
SHA-256: 26f364b2abb0b3622951a1d5555aa15cb5e55d6acf20154d7e25a78bc49140e3

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