Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6807aa59e0659c…

MALICIOUS

PDF

88.7 KB Created: 2021-08-21 03:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54dd47657563fb2b7a1019eec607ef47 SHA-1: f53a63584b71c39992a370ecfa5f953b5097e29a SHA-256: bb6807aa59e0659c47b37f4ad832bfc3f7f3e7b0283738cb077dd4c31f10e9ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggest a link farm designed to redirect users to malicious content. The presence of PDF-specific link farm heuristics indicates an attempt to obscure the true destination or distribute malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c400898485---66101285168.pdf In PDF document text
    • http://icbiz.ru/userfiles/file/jubivonunuv.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39de080f06---misemupik.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607efe9529fb1---49115630086.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/41238994916.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/jipigedasipowosoto.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/45894128044.pdfIn PDF document text
    • http://normel.org/files/upload/file/rawanimogasibibedokuti.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/43k2a4lv7es3st9gvsndtmcirb/fiwimowevinojope.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pe37u82nn9h8f6ar57gv5uabb2/86310448676.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/4242021405.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/paridowewisojix.pdfIn PDF document text
    • https://signika.pl/Upload/file/50921459960.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f0aeb819496---lukomebimoma.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/gapoz.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210811070854.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/pijojusewasug.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1611f9752554b4---31251930456.pdfIn PDF document text
    • http://cga82.com/admin/File/fedotoje.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/dejitumudiruvusanos.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3716627c29---sanimatajenurixaju.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd9cf3aeb---2166719428.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1570f370b40099c4aa18eceb397f963c/bazis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rotate+90+degrees+clockwise+around+a+pointPDF 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_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 11300 bytes
SHA-256: d7b07c8314bf50bbbd7a2ffdd9e7ef2783e54f06c12a71fc11da92c0628fb727
font_01_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 18112 bytes
SHA-256: 4cf292581fc6d8777bedd6537d0bba7115ade887b43c9331e95db9b01ef052a7
font_02_sfnt_off00013c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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