Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e33be71cae0ba95…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 17:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1325483416189364d172929a8ebbdd03 SHA-1: ddc04e9569ad0a5421a130c99435004643300c3d SHA-256: 8e33be71cae0ba95e0b2159a57981859a95262a591fafabafb9500b65bec216d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. Several URLs point to compromised CMS uploads or disposable domains, increasing the likelihood of phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://ddmmaze.altruistictech.org/documents/img/upload/files/pexorezamanunaxiwilomonel.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/46afabee279f716e6b740ebf7fe54b3c/21697381604.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/93680522105.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/lugozasopasi.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/desimozegusozimatop.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/rufefevejowarujo.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/tuwudabirepatasabokigar.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/korewekazojobuniw.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/dosagidarowurebik.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373d1dafaee---79708049069.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/47514380154.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/78397007758.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/78287303098.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210901111301.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/53984801296.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614030759209d---55567378633.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e10510eb34---zalimopobad.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a6afcb1db---91768965557.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210912_5F5C4936ECE8ECD4.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/38947585399.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/93408367688.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21090509321095425078xbx.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/51957078396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=emmanuel+norman+hutchins+lyricsPDF 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_off0000c4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 10692 bytes
SHA-256: 3b15711409b400cbf7b5733a833210faf15e2e0aa9ebf2595751cc72283248cc
font_01_sfnt_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 18088 bytes
SHA-256: 461df1bcf8475ff8ece5f81c9033a421792898e828f63d8bb9cb170996bcf870