Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e60ed266d36fd7c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 10:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 58da2bd785958b93f3fb5e12dbf32797 SHA-1: 3b64514b175882fabdbbc3a2afc787713feed260 SHA-256: 9e60ed266d36fd7c68c57ce525c98a7dde1200a9f3b4943718646dc2a0fc1ed3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable binary data, but the presence of multiple links to potentially malicious domains is the primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://rheinmotel.com/userfiles/file/93348737052.pdf In PDF document text
    • http://varosom.hu/userfiles/files/revexutitafi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/pezabufatuzo.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/4c1fdd3d481edf57aa7f0cde8c37bbf3/xugikazusigow.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//36073747801.pdfIn PDF document text
    • http://goldia.cz/data/file/33135839803.pdfIn PDF document text
    • https://csodamalom.hu/files/files/pojiloxavofupup.pdfIn PDF document text
    • http://waterreducer.cn/d/files/66725703771.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/bajekezobarusebelevujude.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/lukopuferobopamipesun.pdfIn PDF document text
    • http://elitk.ru/_files/76513602380.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1ca5818f1---95001458519.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/fofenifirekev.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/43886533061.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/431692eee8e2a8bf11b0e9539ffdc6a5/ketunig.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/98f5c43645c72c039c250b2b79118902/37537293283.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607201709cc06---gakosupi.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/luliwu.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/67708934751.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b818e14a6aafb8fddef36a195c5be58f/4439446564.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7ce9e02c---56987243467.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/53985343167.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/29409024247.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210726_1A6F60AA21718BA6.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/463a1e009cae1524e897b37accef4923/jinerexi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f445988611bdbb53478776902f1f6c6b/97358444931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=parliamentary+democracy+in+india+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_off0000c5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BF 17156 bytes
SHA-256: a3951021c473312fabbdc2f30facd6c8f156ed965c5d5bfaf6fb77ad9235c88c
font_01_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 10728 bytes
SHA-256: 5a531529c293ccab411fbb957aaae5d498d433a669b16465c244429ad4384dd2
font_02_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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