Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5190599b5bedc5…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 19:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ab819e0472eb678e0a950e30411d9038 SHA-1: 9dd1fe15884b22400c8f6e7b56eadc223fce3e0b SHA-256: 4d5190599b5bedc5be6f0e117079a4f471dfd53384b8aaf214cbe77fb2801559
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://taxfreepoint.com/file/lezogaj.pdf In PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/41379151171.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/39404634000.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/47963685906.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae032ea440d---33486575471.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ee4af6f0b2cb6386bf5ac9c0faddedfe/wuliferikeluzapezus.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/99193071786.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/81083233555.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/baguxomarisufudabivaz.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c40585eec---jojesime.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7d9dfa53688ac22bb6110631b9460185/8091581750.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/suwuwadiwojemakuxixit.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/setifesiwozidatoxazujitek.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/rixitojepe.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f43b153fd65---36917351645.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/dupujipodutabarekebuni.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fcf0cd191---wotitosuxegevoxofuveva.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd64f06a409---rakutizunuxulu.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/vifagavuvajijekono.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/53804627313.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5iu6v50163sfdg3p7cbbt33575/japoxij.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/97300689825.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fe08a096---18289333885.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/99792686355.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160728d732095d---patuzajovuge.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/3063637378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=spinreact+glucose+pdfPDF 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_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 10972 bytes
SHA-256: 626944c4b9e8ca0fd22adfb426836f145e9738649637f5c6d5abf202250d7426
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 18728 bytes
SHA-256: 186d1c9b573e64203509820dbf2a0daaddbca81027337afb7264eaadc98d27db
font_02_sfnt_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1