Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dd86ef2914ed4a…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 13:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d06e067080234eb1d0b316f4d6e7b3e5 SHA-1: d24aa68a628501c92de596c69062f07adb5844ba SHA-256: 52dd86ef2914ed4ae4b722891143a64b679a2ac549a37e241d478f1877d4b85d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an intent to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://garglob.ru/uplcv?utm_term=basic+french+questions+and+answers
    • https://zoorichi.com/temp/fckeditor/file/vetumamipa.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pfknril90jmpu1l1ilan3tvqjb/31009425009.pdf
    • https://sport-jicin.cz/dokumenty/7329074311.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d13431c49---75233464699.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3a6453c9e0c2902ae0a504de0a733fc3/bikoletemotuxepexepalijox.pdf
    • http://rheinmotel.com/userfiles/file/gosudewefibotava.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0a7e8a3ab79971469b127702b2d5df60/pekuduwasewinitewi.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/15946090659.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c51fa3d73d15dc920e76a357f4921de4/21413858434.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/gvunmv9d8pnh3tirghsparcqe3/76086256269.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b967fa1d---88092169372.pdf
    • https://littlelightnepal.org/userfiles/file/fofop.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/31031135f6761b73ff63235e8ebf29ce/56544099280.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e26151e8377120234f2e5565f3ffcd2f/bibitugidipewefeleruvi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faed.bin
6dec7764f761dfe818e590a0d004eed2445dc39c27ebea7a685c3808e97914b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 19952 bytes
font_01_sfnt_off00012c5e.bin
ef8accda88bd7e01ab65a7a93bf93cec4936d9a13e531f92b76465b4795124d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 10912 bytes
font_02_sfnt_off00014579.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14579 16792 bytes

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