Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6a257b41e79db7…

MALICIOUS

PDF

92.1 KB Created: 2021-09-01 08:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d59175294743c908f7e9919d0be8fc3 SHA-1: dd17b1112ffa0074755b5738afa7fad173ce1714 SHA-256: bb6a257b41e79db7b3fdc97710e3617375ecd2a8aa7c663285a29a352ee05267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms. These links likely lead to phishing sites or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=african+continental+free+trade+agreement+pdf PDF link annotation
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/96694678859.pdfIn PDF document text
    • http://ud2-140.com/files/bejupeboxatakeriw.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/6b6c89645d5fcce3acc7b8f401758551/6095102975.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/476d600cf9af904d641a24ac44de935e/gakezivorinibotabalu.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/zapinipuwekit.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ndc65fm22dqfff9otca9qpqu3o/mowefela.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/gamusifilakeposetapumasap.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/88s9mvq6s34eudukm6o6ufhag0/bisubemosonudukoju.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/46524499486.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/boxavozosurivikadopu.pdfIn PDF document text
    • http://iwishop.hu/file/30677759285.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/9011184878.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/e985a427882b3b53b737cb58795298a1/fifosozalovemorawikujixod.pdfIn PDF document text
    • http://springbook.no/files/83850045112.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/ladinadir.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3ffbb62e---51938800470.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7d673c04---65064132056.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d7db60421be16ab883b60165184f9fd3/20875171729.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bnn2csds6f7kv35mptajm99bja/34897934400.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jujiwezutuzun.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be25d03b63a---12276902748.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b10533afa32b837c88a007381adca1e0/rowutojekogelixakudigoz.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/6cc4a05311777e69ebea3d690b5f612a/gorope.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_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 10776 bytes
SHA-256: e7f80d01d2dda0f423a1a234a50cbc8523e633199f29b211a6b7c2f8c9043672
font_02_sfnt_off00012e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 19428 bytes
SHA-256: bfa1aee68e323a76f780f1ca783d1c28814fc5b68df9e8abbefee4459d3973b7

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