Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f707fd75c62911e…

MALICIOUS

PDF

92.6 KB Created: 2021-09-08 05:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 39576b4d541af835c81e309fbfb2638a SHA-1: 40a1910416edb5b3d0f6967e5c67063a590c533b SHA-256: 0f707fd75c62911e9750e59f760b6ccd87467c020cb3efada5e83d687e8029e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage and other potentially malicious sites. The PDF structure and embedded URLs suggest an attempt to redirect users to external content, likely for phishing or malware distribution, aligning with the 'Pdf.Phishing.Trojan' detection. The presence of multiple links to compromised CMS uploads reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607768c49ade4---43709280907.pdf In PDF document text
    • http://dhf-china.com/d/files/3640703885.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/59814717086.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/52834baa62308493666127bad587382f/xanalokeluwubug.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/79fe63f2f6ad51072bf5bb3a26113cf9/90467521148.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vibudisop.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/67521792412.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/kenatesifafikugegemi.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/37091228355.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/bamawitiwad.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/gaxebagoxojak.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/r6goi4l5a8hj5u6ldshtpm9da6/16207765676.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3e65539c6---rifoviduku.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/fugexokete.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/66530664646.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/audhb4311d4aaprup4ddgcg7qq/seturikig.pdfIn PDF document text
    • https://ebooksweb.net/files/file/15287017781.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/73dff7107b78700d92a2762050a00cb4/65973481639.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161317e8991096---6068653733.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02ee0c12e---bekevedavukepebibe.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/gijowodekuzupaxuzopolo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7160c7007608b4a8746e79c348e3a6f7/18715660986.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/vinawajijegujonudi.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/sedaninekupabulim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=political+science+syllabus+pdf+upscPDF link annotation
    • https://mediaget.com/userfiles/files/88596580801.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_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 19068 bytes
SHA-256: 8233401bd7fd15d8e92eab2f9867351e9b46e6ef888a70a19a28ca1c7bf3e1c7
font_02_sfnt_off00014b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9B 10868 bytes
SHA-256: f79c1d00e2c8b737e311288a47d09e9b58934699973fbb391e2d671547de13d0