Malicious PDF — malware analysis report

Static analysis result for SHA-256 914dee6a7aef93e6…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 02:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9388b80346b2353423d3922d9775774 SHA-1: abf3f6ac5e3e199a9e673c246532a3c9f91f3f78 SHA-256: 914dee6a7aef93e6fa40e6e8000f68771ff62c7206375cf621d7899b9da195d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://erh-hu.com/userfiles/file/1928493497.pdf In PDF document text
    • http://aurastaffing.es/upload/file/lufebatakaj.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/tokinijugepusidelibipuro.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/jijadotuziwib.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/jopibirimudagigezunar.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/48764572121.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/10489837864.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/10547996254.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/84576675251.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/59257919113.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/legakafu.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/kuzopuba.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/gonobujofudedodamo.pdfIn PDF document text
    • http://binhthuocsau.com/hinhanh/file/womuxemisarikesozuzebob.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55c0179fa---kijibapezevutosekubopifem.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/59350826155.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34514948931.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/65634729848.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/vufemedixumojame.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/sulowa.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qlcp9e2lipmmojn0dr9d7vi7dk/roxaxazumuvexikanovod.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109111025134004.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b2b635db3c258e9498f90844afbde529/fetigizokiponuvajogepewa.pdfIn PDF document text
    • https://salonrewards.ca/images/file/xijijefowapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mvc+vs+mvp+vs+mvvm+androidPDF 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_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 18036 bytes
SHA-256: c69e4e1797511ba9ad4748392ffd322d28ba40f795d44facfbae82e6af4d2d71
font_01_sfnt_off00011518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11518 10460 bytes
SHA-256: ff9ddfc0e5456796e279d5d47be99b5fe232e4d988606348f408c450578d8c0e
font_02_sfnt_off00012cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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