Malicious PDF — malware analysis report

Static analysis result for SHA-256 8790ada02d1ee72c…

MALICIOUS

PDF

77.4 KB Created: 2021-08-21 00:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d51cd4dfeb9f6a5a57d4a55bc7f5cc6 SHA-1: 6995b57ef705c57f47d7354282542e018d662113 SHA-256: 8790ada02d1ee72c71255f2bd2b851280525d05c593ab386bbcc7d26356e7eca
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous embedded URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/belirinoduxudezadisa.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/orrte1eqqkomft6iodig9420l0/47178036022.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/tolesepoj.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/viwevatolavizexezasit.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/896713f6357cb43c24c7fd01d049cb36/90513821730.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/514cd60bcfcfae8fc0136efdd17a344f/kitasuwuzenidekeditegoden.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608817bd373f2---17634333870.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/79866846732.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/sazodupagobenox.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/24501578240.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/9919082724.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210715_6CD46BC8237808E3.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/e9jeve1mg4ch9kj0it1dt7j0qf/selajisonowefebuxupo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812908c1d07---10518442725.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/fb134410ab43e61ceecc08d8eadf1e19/60058680661.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/63377245202.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/dereletu.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/pulabije.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/23154994447.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a866b8d7e81c23e223c5a58024768a83/77484399617.pdfIn PDF document text
    • https://etimes.mn/uploads/files/98525192813.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c8ae4e2a17395aa3da2c65c2d6c4a306/25620918137.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f64c3da565f---73638764538.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/64278558713.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4593d07d35---wirusa.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a59af0760a6---89279227932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=yay%C4%B1n+denizi+aperitif+matematik+tyt+%C3%A7%C3%B6z%C3%BCmleriPDF link annotation
    • 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_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 18096 bytes
SHA-256: 03580931c29f09df4209c5d234e0ec93a3168d219502e20066aa72140005579d
font_01_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 11268 bytes
SHA-256: 2746715365c3ce1388acd1e6f4e6ea9ecd5c2ac41298cf5bf2604dcb8d8fa63c

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