Malicious PDF — malware analysis report

Static analysis result for SHA-256 764b68bc7f8caafe…

MALICIOUS

PDF

91.1 KB Created: 2021-06-26 06:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9b620eda6740981336dbd32a1df330f SHA-1: 2e4f3b0cc0a9bd3109d09e485d22777b0bf56463 SHA-256: 764b68bc7f8caafeb08e615669b161e8814161a29bddae7c8ba1adb5fed47dd8
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 links pointing to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/uplcv?utm_term=the+secret+of+mitty+walter PDF link annotation
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b39996528d---xilopofafixajozukobasapo.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/98068230070.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160878a054fd79---gitamovinu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d628e49c---61546666804.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd088541e---wezuwatadademu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/043b696805a0a00f5f0bb43fe4407d74/wetesuvifuxogutetakep.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/becff00a3f274cc5187bd852794f1015/pupanari.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lf4i0jc225mvlk49palkpjas67/2686510066.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1ad08e08---667160294.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/25522154967.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/e82d38c5b21a3016bf58f58d189d7f40/witorelamagorup.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e8bc3419b---laxudupunugasagovomuk.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/jopisezojaxonubutewegop.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/wafasamifaka.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0dfb9318f2becceb763987a9c5057b6e/xomapetumikajafikadazixaf.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb53c6b53f---xezoledekodopizibasisi.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/30980714614.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85cd1ae0b---59534128694.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/adb44400985f098eb06c1cfdaa3b1258/siwoxoz.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/66188480368.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8da5b71ec0---73032751213.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6o0lonu5rajdumfnc5mrjtqfik/87006547834.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9fd154f276b1cd4190339757d4ee0b57/surabolaku.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/zimijade.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/sodafumoketakegubokoli.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a17ef0fde2---jiwesulufupunagofaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 2296 bytes
SHA-256: 7270b85de82ed3e19fa36c28d7d28d4bfe1d2fcc3cd0591494dd2fc760998df9
font_01_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 17128 bytes
SHA-256: de778f1dfb3d4befaecdbb896d3cbc80f6ea7a6ee742edd863e43864d581817e
font_02_sfnt_off00012c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14445 10660 bytes
SHA-256: 633b2686e3817421b991ba7584f294c98f71d41084f5ef488c325a6ea269744f

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