Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcec3a7cc6ed402…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 03:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86949adcdbb4d8dbee6a58018c0dabef SHA-1: 2ec5b6e98380c7db1ea5dff66d9273efa4cd6ea1 SHA-256: 9bcec3a7cc6ed402183ba13f111506171e22a7f7404ddddbf9c23e016774aea4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the nature of the document as a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=business+plan+canvas+ppt PDF link annotation
    • https://blnk.eu/userfiles/files/87866592044.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gesodunofazaturo.pdfIn PDF document text
    • http://mousike.it/img_ins/files/45301361142.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f5cc2b2f---lewavidobosaremeferovu.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/14138234732.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/jewuvibe.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/18055193429.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/12801343770.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210704064811.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/jewokita.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c43f6eb1cf---wevobesazefiviluxaga.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/38740239505.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/88551316588.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c4c3e3de13a7361b1e7d0ce92049a050/51146297819.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/08f339496c582f7386f8787212179c78/xijiwekizufuxetixaber.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/wilirujatinovurakakam.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/bapuditerufezulu.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ecea3k92hc4j5mv13nipaodhqa/buzazodigutaputunab.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/1618258509.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/pinopakiwuxapulefemoki.pdfIn PDF document text
    • http://nprofit.hk/userfiles/ligufepemagebupedi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa57cef86d---50631989245.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/49008903716.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_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 17640 bytes
SHA-256: 756da46a80382cb5afa9ab8b321eff6cad163e04e7c9ba28d2a2ce0d516e78eb
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 10368 bytes
SHA-256: 0ca6cd53d5f55544886fd561822897fe9ae361b6bcf5b51120a2febc9f23a3b0

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