Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39d6ade7a3d80d7…

MALICIOUS

PDF

91.6 KB Created: 2021-08-04 10:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 076ac32383cd2034e2b7936816da98b4 SHA-1: 1d07a0684812f7628de7ed5d612cf226e05b160f SHA-256: e39d6ade7a3d80d7e39aed5d82b7cd6f9befe25022f7fd4deccbebff18c4e030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The embedded URLs and the nature of the link farm suggest an attempt to drive traffic to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/6dfa3428730f29f00a581b9c38d965b1/84773196486.pdf In PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/jopijonuwijidugugugases.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df122cffe5201ab1dc0a399506a7bf55/jarufewibofirafiruzopez.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/89241591807.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/50880745656.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/82353692243.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/viwekimesafofinab.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210726_08923611D19D0331.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/12353015834.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5p8lad2opd0vap6fmn4rv0ev77/22611287854.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/30035409783.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95251561c---zowenenabozatoxugid.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/vuwotironifilanekizulan.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/zonijovogozex.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/pexamasozumuwozimo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e48ac2b67---89278997916.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/22135218440.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/g79t8h9tbpei9mqimqk3til55j/78164894426.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fed135c6b---10402949917.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/femonuwekejazugunud.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/911e50c2e80bc2386bd19d58d4ed1a14/95640258298.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607367c4b260b---22783547666.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/19110385985.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/disado.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6db150d4bf---gazasiwuniwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+free+followers+on+tiktok+without+having+to+download+appsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 17404 bytes
SHA-256: 9e5e814478a5e95113e1f29de9efef0eab19e2a150a8a6495b333e5190883044
font_01_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 11112 bytes
SHA-256: 103345c259fb772ae30ba1356bdc7d22281ad2c82b8db90c4155e6657d568a81
font_02_sfnt_off000131f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A01 16356 bytes
SHA-256: 32a61d067d170ef84ee3f83ad1ba2cadc23e725b0df5007dab6ea629016899fd