Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69ea4f7ea6a8e44…

MALICIOUS

PDF

112.5 KB Created: 2021-06-26 12:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b8ee656b6d14fa39a2f3fbf8e4c00d0f SHA-1: 121a85196edabaef1a76f03e898dc002915ed50f SHA-256: d69ea4f7ea6a8e44c1958ccb6e1c43ba0020581c9f1363ab5c637cadbc087f49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised CMS upload directories, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for further malicious activity, such as directing users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://www.radio-kum.si/data/files/96556830841.pdf In PDF document text
    • https://rabudiagnostic.com/userfiles/files/81937827161.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ac5e3f1e6975d857030e945e2f1740fb/zagulowipusirura.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/vonokanuwukabomiperarapi.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/rurovazunoluzudoku.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7f4eb923e9e9f22edd24c5810e51c03f/logogaripugiba.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae48b9fe73---14751925875.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/20568745890.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e57163883fdde5f44dfca93e1e063be3/getevukadabemujibofem.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842676503c---zarimizemukurotuzorojizel.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a857d2d834---41610629426.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/63627610953.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a73fad3cee3---zuketibaruxis.pdfIn PDF document text
    • http://daydala.com/userfiles/file/nobiwitupiruj.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa7d71f97---18739770392.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0sjsro833iodmuljvjj3cm3p8e/17461617724.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781737e9247---21108122184.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/37083915034.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086e94264944---90024633076.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099d055e0ff0---53066354974.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/zabugoxuzidil.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0b631a84---kazipifa.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6ce73c8095ff610626ed7917e8125c53/kosulebebudibaxagu.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/11737224090.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/ditesuresimisakupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=refraction+by+spherical+lensPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B01 16108 bytes
SHA-256: 9ea9197b6a75c7fe67a727ea228f5add925cef9a7182c4c37535d81b948c8910
font_01_sfnt_off00015037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15037 10876 bytes
SHA-256: b953a44a6f591c6e6d0a49074e326d723628e61df374fe3820e202fbd82ece1e
font_02_sfnt_off00016918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001812a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1812A 19192 bytes
SHA-256: 022b50abc1e703066acc6e2677f0f2b3de8f64aba7cedc49046f71a72aff7566

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