Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1703b83d5e6fd27…

MALICIOUS

PDF

96.7 KB Created: 2021-09-24 08:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a126f04c372fd1a0ef2a0e61cfe7da8 SHA-1: 640b4cd1980da3d65a9321e56552a13eceaa5ce2 SHA-256: e1703b83d5e6fd275b285a2f2e02669087dca6f7c371344aac24aec72cfd58d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains a link farm with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f20ab7092---47222718575.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff42851468---muxizenitufosefobutimer.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/mutapubosafafujofebodag.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/rofipileguke.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/wuximajis.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/480383493214ea07d02d271825f2c102/6449713779.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/xikufonofexoz.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/57989162044.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/vujipujo.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/siruvefufoj.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/91570458266.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/dijoxutunaxujoboke.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/tegovamadixenimefato.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/vibafudulalu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3180a396a4c71dfea733e36398e99d5f/rusexupamilape.pdfIn PDF document text
    • https://gdaniec.com/upload/files/69184876312.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/gagisadifo.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/judaruxilexat.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/36921337024.pdfIn PDF document text
    • http://lawngo.net/fckfiles/9014812181.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/74897871805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tap+drill+chart+imperialPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 19240 bytes
SHA-256: d267d9884f654af918f2766f834b3a8ddcfb717683da4bd5a3107edf40f6606b
font_01_sfnt_off00012fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC8 16168 bytes
SHA-256: 6cba6677bde0f241d5abe4bd1daabf497e221bd6197b657de4268e87bbbbfee9
font_02_sfnt_off0001456b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456B 10352 bytes
SHA-256: 687a80bbb97393ab99724d7e8d690e91cc03ad834731030210ddd4cdd1554695
font_03_sfnt_off00015cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1