Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cbc1576cec5a00…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 02:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b4c4bd7da5c77228ec3583e9235e886 SHA-1: 0e768587029aae204977e7ae4fac4cc27d6c3f61 SHA-256: c0cbc1576cec5a00100c500f0a29e9ba9b72593a380fcad80740886f7e2dbfd2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. These links likely serve as lures to phishing sites or malware distribution points. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/da1877deae482bbeee02efa5f7122e52/ruvixomuluzovubowevox.pdf In PDF document text
    • http://kinel-hunter.ru/upfiles/file/rimelana.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5dceba3b---28460811336.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/24755911262.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1429eacd---25416977833.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f0679adaf---53082187366.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986480efafe---52356966062.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0c40a1464---2969752828.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/4336214523.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/53908525466.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/sorobok.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a54fd9010b749da661d619c41a5875ce/sebowofomomeket.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/30432395268.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/37035983727.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/38169477075.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec99075a4---fafibuz.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/tuvemufoligixejux.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/titojizarajimawobufagu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1122fd8e9d---15797505758.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/dpcp8p01npe3terl7gj8ts8gu4/buxoxigokubolukovenesana.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/96209605526.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/pujukitas.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/goduguzezoferukedolakeku.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/maxerelejip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+rime+of+the+ancient+mariner+critical+analysis+pdfPDF 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_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 10960 bytes
SHA-256: d6fa2157032adfbe556954a9e621850645ae56c62657a7f7154ee54653300e95
font_01_sfnt_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 17620 bytes
SHA-256: aac684f0ddd7be76f2a0e38e2a07fe901d7981675fbdb3c383f40031933b5d2a

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