Malicious PDF — malware analysis report

Static analysis result for SHA-256 51086fdaada65c4d…

MALICIOUS

PDF

97.2 KB Created: 2021-08-17 18:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 810bc80a659493b2e793b7565dd90146 SHA-1: d3bf7be107bb095d1f52b4518d4100353cc626e6 SHA-256: 51086fdaada65c4db443111a6a658c29fc1f24dad49fca2ce8642e3a90929be9
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 websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pafigaf.pdf In PDF document text
    • http://koszyczarek.pl/userfiles/file/biganofaru.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0c373c994---68478616633.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd67546b44---tisemove.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/42690325532.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4030b6c419fe8d6d6403b8addbd101b9/jigoxujomopezeziva.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/8313173056.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/47746271226.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e1d666c853624f5fbb8bad2b20d1b72b/xesolajugijakegedolelesir.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee37f31ba3---90690912108.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/kkdjpt96bp9dqpc4f0lf3ckfb4/97814178023.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e997bc287597707c5cf5f8a0b815194f/nuporiruxarulezoxu.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/sutubefuludetejike.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb78fbb0c8---84347338066.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609848e08617f---vekab.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/63924884227.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160885e9e480a8---kamugin.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/84369873430.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/81lcutqteu7v33dsu7u2fpes50/pemokunexugipaxajisiluti.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/goponanesuxan.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/37032955151.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b3b55bcc6---nekijumegu.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/17580733941.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/99caf181bacf81a3c0f53efce639c264/namuzelafijumifuna.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/mavizami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=reparto+la+novia+de+estambul+actoresPDF 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_off00011706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 17452 bytes
SHA-256: 51962f745fd0a50442ce4ae635af517340a5a0fbb7930c503b83d71eba6e1ad8
font_01_sfnt_off00014341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B58 11024 bytes
SHA-256: 4b6554ae5ac023a469ac598b2d4f71f4ecbf37f2ce3819ed2f5b46bb4e28ab65