Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e99f6896c3e9af…

MALICIOUS

PDF

91.9 KB Created: 2021-09-02 02:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c90672de541c392e01dd8c422151bfd9 SHA-1: d65a02489c01dca3739969c9348e00be96bc168b SHA-256: f9e99f6896c3e9af1e6c6a84e7662518597f077ec83f58afaaf39a22afc4b588
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting domains. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://toyotarent.tw/FileData/ckfinder/files/20210623_75A70F9EE03E0C69.pdf In PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ct8trjfj9edbliubmh90kc3duc/fujetegemiv.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d61103c341---ruvigewu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/e2rjj2uvheigjb8g54a70lbm62/rovufafezepu.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/4859542680.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/298h6l5pjqpbdfeu0i2v8fhbq6/93331800617.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e61a0b5c2---28566123042.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/bimij.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/48951270353.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/d3aeb74vgi6bnj49cfmc7m75u7/65625353482.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/bigixomevufasopuwemetaku.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/28337580246.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/d3vr902iff5ano2plkmsav5e1b/1330820298.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mesulorugurum.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca80de3255f---11469018204.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/kuvipevudanulozape.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/38834923349.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f00c97886c6935a159c36ffcb6cbb4bc/xibowabe.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/gakunotixurupiwiw.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/74521856587.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/xutezonupipoxa.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sitotijimetakoxibusovaliw.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/nerotinavixuvadesubebitan.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/vodedokixapasidimin.pdfIn PDF document text
    • https://dptech.vn/uploads/files/65730441315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=come+on+come+on+the+radio+onPDF 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_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 18116 bytes
SHA-256: d5d8757e8fe43a7f9b721400a2b7d5d6eaa455c028e4ef638706c78e87ee1af3
font_01_sfnt_off00013252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A69 10452 bytes
SHA-256: e0eb99f697edb02663c23edbbefb236c871e539e49c6900acd3d7d0e4dd1569c