Malicious PDF — malware analysis report

Static analysis result for SHA-256 19943163dec98e64…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 14:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e976ba1d5a6a3e738e85b4f2e5b8848f SHA-1: c344fb4fa526895ad2990877ecee9139ccc7ece3 SHA-256: 19943163dec98e64df2342e1b6fcaf2255d5bf07dc63c5f2d7cc667df97e5929
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=rs+aggarwal+maths+book+class+7 PDF link annotation
    • http://luligang.com/ckfinder/userfiles/files/metibavoxigilun.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/dodofusutafiw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/69bcd7378f67564b03aaedcf3921f4a2/271995960.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/tuzufa.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/58815308947.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/19319227408.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/93704175288.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/50541650512.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/sogugisekiwekilodax.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/fumezavaronitoje.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/37738755914.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/72538152474.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/xizowuraful.pdfIn PDF document text
    • http://e-sportis.com/images/upload/66691026919.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613509327f6a3---55593409486.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/subukaladukigemoxakiv.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe456bcf3---69516908451.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210911190131.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/nibusumonavunorax.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/88169909472.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/wixatutusowupinefabibetan.pdfIn PDF document text
    • 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_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 10760 bytes
SHA-256: ed09db9f2055f113cca07d590117a5502b9f9a32518f8522ed1b931155c31ac8
font_02_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 17444 bytes
SHA-256: 56f25f3e35f926b395cb067e492af027e09c640bd213c6b141dd4b67fe4ede13

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