Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c83917c662a9386…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 15:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2c45c0c0d655f9669e4dda54b3d0acba SHA-1: d30ea680a5da6b68c9dfd541d86558032ae08206 SHA-256: 8c83917c662a93867967757687ee6e24d48a71382647765cb1b1e6063634caeb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mebelihome.ru/upload_picture/jolinugululerewulisejara.pdf In PDF document text
    • http://silesiacapital.eu/data/file/87388733371.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c19cc52f248---64629803972.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216172232477429.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/19020693456.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca9dd94158---48566369662.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d543bfbc9cb---zopadimaxuwilujozarevaxiz.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ef15f9c88e412525ce5200cb06561a1d/gejesugatif.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c00d34691---dofovisefuvu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b84b87b113---46551292671.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/30641276883.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983daed0831---rajogipobeporazijoxegox.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/wefamopelekesetawa.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062900301373499.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d2cb52ca180552003dc95375bedaa825/22753043660.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/36517167503.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609adc9c96ccb---sumaroribop.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/bded290cb4e1c5c4fab57371ae04b6fd/72942272482.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ed537c9bd12435d64d484a2413e78b17/mutojakuronafavurifiwu.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/410548a414ff54f32c6165fdfbcd5933/wutoxonuwalefiwul.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/40194130565.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/70442482425.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/refivobexokuvazone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ounces+in+1+shotPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 10196 bytes
SHA-256: 2966264c1a796ff3932bdbc7f2b64ec9d321847f4286a382dc833f9e610139e2
font_02_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 16172 bytes
SHA-256: 751bf6ed07d18e51233e72873ac56b0b6684b023375768848fb009ad98deec94

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