Malicious PDF — malware analysis report

Static analysis result for SHA-256 f702b52b5fe5da51…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 18:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ee385c1fadcb1fa772609eaeac86b85 SHA-1: 2e6dc204f4fc01f0105cb5865df0023390175ce2 SHA-256: f702b52b5fe5da51f426b46a0895b24235a47f13665d9012169342f68ba73415
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 ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://smidgel.ru/uplcv?utm_term=morinda+citrifolia+l+pdf PDF link annotation
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca2c64f17---29896316647.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/85064712461.pdfIn PDF document text
    • http://momsystem.ru/public/file/sulezomijavafazipujurofi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07fff0bdb---womipebewagidazizipukiw.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202108311123157809.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094269d852a1---matawosegelaju.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/58697584594.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/52057246877.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/gomalebaviliwut.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jupuxuw.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/kezijoletolelepiwojaviz.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ba18c8d542c3a11d06126146e33421e8/53964696552.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/melajexuvewiwarejur.pdfIn PDF document text
    • https://poker-fire.de/file/96752812028.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/88148696223.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4tc2rqab069cmjeki50dj71jm1/mezex.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/bavunorimolex.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/3150730793.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021070214234771.pdfIn PDF document text
    • https://mattress-leader.com/media/depeniduzovefozu.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/3792711793.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/funilajotuvoxiwejado.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/tisil.pdfIn PDF document text
    • https://www.pbri.in/ACP/ckfinder/userfiles/files/92366213498.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/56821870293.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/f5a2la0javjbmdlhmtdr3p13ud/vikapafinamalejiti.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3fb98d53411ceb3e7f1f4847205a1516/bogedijokitisenobanuwo.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_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 10308 bytes
SHA-256: c9911697d7be9358e9de64aefdbd555001e2fdc407bcf13424693c6d9a27fc44
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 18956 bytes
SHA-256: c46a1263ae8f3e867bafaaed50ee3452e9cdf9740784e14d31286e9b49d390fb
font_02_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1