Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21f741f17fd4ba2…

MALICIOUS

PDF

93.2 KB Created: 2021-08-14 15:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 750481abc4823ff97d2d640269d672ef SHA-1: 6f108f36e0e3d68bc09020a6f9ca5fb165936957 SHA-256: c21f741f17fd4ba2d373a178d1ca0013b3e3a94c03e6a1a5d17e1edc1676d368
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a link to a compromised WordPress upload storage further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dichvuketoansg.com/luutru/files/kawilo.pdf In PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/18015771274.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/dofit.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/dpagi0hc9km56jrqn50hea0hg1/sirazodez.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/88741778368.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac3a4dd900---gedexeko.pdfIn PDF document text
    • https://flomogroup.com/upload/files/34755087613.pdfIn PDF document text
    • http://armanetti.com/images/36547145836.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210715164232_ghcwj7.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a4be2f701de---4601762360.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/80481766349.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/dnn418g8nkv5lr8817uhr74hm0/5447393097.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c93a0be3---71377278224.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/febozeli.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608686e94c1c6---25765098247.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869def58864---zigulosufosunigisuwif.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/87098768841.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff86f0e71---82671389322.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/66328202146.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de6bbafdb---43800726045.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/dobogagimosugelede.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/53542632548.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/65807798360.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/nuvusedokerugitez.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/50140234225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=new+hollywood+movies+hindi+dubbed+free+download+filmywapPDF 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_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 11148 bytes
SHA-256: 1929c620e888c7ba7cc7f2659f528f397cbc9aed78ea86da4c444bad8187d6d0
font_01_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 17444 bytes
SHA-256: 50650b6ce410e0fe1fddb9c7fb35b1a6d8e0ba9e3311ad628bca6c1993052c8c
font_02_sfnt_off00014da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1