Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2fff534352cb45…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 18:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d9d8aa9787d48af34a7ab1d772f4ed1 SHA-1: f25d24e510abfdf9b0c95c6d99491b0187a874ca SHA-256: 5d2fff534352cb45fdfa647164c359369e00a535189acf665f641a7add9ef8ed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 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 http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/nisuvuvo.pdf In PDF document text
    • http://yjsyrj.com/userfiles/file/kakamozexoluturanaxowola.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/4f6663ca1172ec36cbf5910629e76e32/jogomesowatifirub.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/betelaveju.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/us5fgjfdtfhcaddl3gg38fkqf0/32451969216.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4472b5b155---31567663519.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/fuzulawewadete.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f9c6625a0---60756032926.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bck3t8d1b1bccst280fvbrlsen/14364442575.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/1rrorh36snrv7kadcjk82kat84/33216041100.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/8873617542.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/19736741816.pdfIn PDF document text
    • https://people11people.gr/uploads/File/89552521981.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/94547007002.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/35935815468.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7dad67224---98188953513.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108080801454362.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/95865782871.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/27620396436.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/15970e74de2595912415f1881d59690b/14884842950.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/dapikufakiwomib.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/87936325636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+deploy+war+file+in+tomcat+6+manuallyPDF 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_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 18488 bytes
SHA-256: 68711a7ca8bd99b3850ea4dcb29d0a5958e51f2de1f2b89076dbb9686d86bc0f
font_01_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 11072 bytes
SHA-256: e8cba5ed045f08d19115635d8d0d2fc96f02be4b08cc5e511bab593d7d955ca7
font_02_sfnt_off000129d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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