Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4c7ee38a5709c4…

MALICIOUS

PDF

74.0 KB Created: 2021-09-09 19:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf7eda84e5822b9e3c1469dddc3543e3 SHA-1: 00125daf7b508b0a7176c24187d6ac38e1cab93b SHA-256: 5c4c7ee38a5709c4ea65126b57aa3cd02bdfa6406a6aaf599e896dc14bc56e4a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://crysiq.ru/uplcv?utm_term=latest+cleo+for+gta+sa PDF link annotation
    • https://holocaustresearch.pl/nowy/photo/file/ziwasazusetutu.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/bogobo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/59374057576.pdfIn PDF document text
    • https://jagominum.com/contents/files/24657338672.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafij.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/73060449508.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130b16be39dd---duvalurativojifiko.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/rumirokovotimi.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/fusetesasumesaninoxu.pdfIn PDF document text
    • http://teakdeck.pl/files/file/77523327332.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/kodix.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130abcdaf8f7---wirujudeb.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/91034270442.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/rufesovap.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/98811039398.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/tesujulitedufit.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/memawoxoxozoruxozuwisifa.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/30750196276.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/galavajivelisujesefosaz.pdfIn PDF document text
    • http://besteva.com/upload/files/luwototulidozewuf.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/9525919248.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134f70b3fe2a---doxorudofimewo.pdfIn PDF document text
    • http://mobitransjogja.com/files/9626136641.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f359e382---romajowezukesedoletadimo.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/ratofizenunelu.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/61750837616.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/44905720428.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_off0000c061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 16576 bytes
SHA-256: d3e9f78cb2613fcd977cdad918253de0f7d55c530e70e479a3b797a5cacc5022
font_02_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 10272 bytes
SHA-256: 0effd18038615c72fc180c83ce80aa0c3dfeea8aa6841e59629ad4e204608ab0