Malicious PDF — malware analysis report

Static analysis result for SHA-256 c720992d01f78b68…

MALICIOUS

PDF

81.4 KB Created: 2021-08-27 10:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09a9d13f3de9fe740432c716b77ab037 SHA-1: 528df1986c991ceb514a75991a0e65ee67980404 SHA-256: c720992d01f78b6898ac946ba3261ca772fef459281114ebddfacee0e437bdc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of external URI heuristics and the compromised CMS upload link farm heuristic strongly suggest the file's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://allytemp.ru/uplcv?utm_term=how+to+put+3+pictures+in+one+pdf PDF link annotation
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/wefab.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/vijenulalezadokoxefatamu.pdfIn PDF document text
    • http://hak-al.com/resimler/files/gulukimovixojenukulelaz.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/65701b767bad2ffd1221d6da749b89ae/nibizaxowujuzaxusose.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/72971455871.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/32240763138.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/05/files/210529105536.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8ed779ee---xafoxulekazi.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/7059157604.pdfIn PDF document text
    • http://fygl.net/uploads/file/27150337896.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/senakixoroxox.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/4ad1921c35b8431d435c3e96b7d3222f/18798515809.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/tasofadusuribejowopopumub.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2a3a236e---48126802870.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/bakifo.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/29979990068.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fd06a43d3b3---vibonafatekuderawafimalig.pdfIn PDF document text
    • http://avenue102.com/uploads/file/74716864808.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/basorepuvulenexaka.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/xofesovajixuzilivekagir.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/pezagu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/01b5cf9a95e03f49e3bb665e58d8fb8c/94510385828.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_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 17456 bytes
SHA-256: 69e7931255e1caf1f51a2da614eb6dcc4aab123a64aa720c32f7b23ae9e35772
font_02_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 10752 bytes
SHA-256: af4de8760e1195af84873b795838a11c60c6c30e731236dc65d42f67069693e9

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