Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb782ec957d11bb…

MALICIOUS

PDF

84.8 KB Created: 2021-08-01 09:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38882e691a26b74e906380fe6811e2be SHA-1: efd3dc2ba85389608d19e5bb853452ebed483432 SHA-256: 5cb782ec957d11bb55db8765bf5daf39bd1a1437f3c389fcd54b648209c9475f
164 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links pointing to compromised CMS uploads and disposable hosting, combined with a 'download button' lure, suggests a phishing or malware distribution scheme. The document likely aims to trick users into downloading further malicious content by masquerading as a legitimate download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mazdooradda.com/userfiles/file/76001690170.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a849693071efd2aac435eefe78d7da52/fapesifabi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c5d1e05abfbf7a40915dfcaaf4387ac4/74429842182.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2cecdc9d6a66b27650bf4f8987c1a71d/larulipejufonub.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/5bb5660a395c84a9b6280d5372409e65/27857909261.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/q3s5s5sokagrh7n75kavic3hca/govopufebezem.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/pagujevotaverutowavimuzix.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/e5556ab1bfee9f0fb9ca38cbff4ae9d6/18796469931.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/pumakavexegomero.pdfIn PDF document text
    • http://synergyproperty.com/images/files/51359596664.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/d64702984f28b10c9eb9f4177fa2823d/83201010106.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gigudivapazogave.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/1432412965.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2760f377153b2e42a6e7ea1269d97c0f/70896467845.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607231a9719ec---xuzav.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/10782107107.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/82ua2kg3siei2pkpr3p1eao2g8/82845920892.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/kupitigusulitijas.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8o0dtj5phu3vkhl81e39so29u4/mapobug.pdfIn PDF document text
    • http://capital96.com/userfiles/file/56807148150.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/10741285515.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ed1c47147---98284230742.pdfIn PDF document text
    • http://apcmagon.com/userfiles/bavagipuninukudubejole.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/4816c6c27e8c6d6d35621059ea8cd213/63904357681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=usb+bootable+software+for+pc+free+downloadPDF 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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 16904 bytes
SHA-256: 72c5b4a98b0510c63869d8ae04a7ad41ff88f40faea36682c60065c4c155496c
font_02_sfnt_off00012bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBB 10752 bytes
SHA-256: 3b86544ce04f2e8244cb95da808f639afe6a9f41335d6efd159f5d44408cd47b

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