Malicious PDF — malware analysis report

Static analysis result for SHA-256 d203cda0da0a6fd2…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 10:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7eecbd7f5f6085bcaae7ff6b9fe7ff1 SHA-1: baebd82c812c468f08def35fe2dec83c8c42a799 SHA-256: d203cda0da0a6fd27ba3c9bcc4cbccb0014efc411ce24eb5a4ec410c3585be04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://madeinstlucia.com/userfiles/files/49370912832.pdf In PDF document text
    • http://hzxf.com/images/upload/File/nobajikek.pdfIn PDF document text
    • https://tekartltd.com/upload/files/wupedogoxisijawadigo.pdfIn PDF document text
    • http://bjjiffy.com/upload/58717352150.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/89183224630.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f101eef644---giwivolidoxesamelatudebaz.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210911121106.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384bcdd185b---tupopem.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/47577338109.pdfIn PDF document text
    • https://egf.tw/test2/images/file/59433919504.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/73942606848.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/feripogubulidos.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/41653423956.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/rutokifukodiko.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/wupanitixegibuwi.pdfIn PDF document text
    • http://lse.hu/userfiles/file/lukave.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/91724667745.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/30370532223.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/bebowojikevukatipediwifi.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/92038198280.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac65e0bd6---vopaxiwuz.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/48060671555.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///24719281604.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/44512215613.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zuzawapixobofo.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/nebedevagajeboxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+harry+potter+philosopher%27s+stone+onlinePDF 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_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 18388 bytes
SHA-256: 311f0fa4539993e89c726c9829bf83e1d5ffc57b977708fd18168275388f00fd
font_01_sfnt_off000111f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 10612 bytes
SHA-256: c27d90c30fcfe32a6e26dc6bc9fae83ed6cf90c72cbaa9e58161cfa179a88e99
font_02_sfnt_off00012a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1