Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5938178ea8e8d0e…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 06:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1b16dc72b6d9bbad2f263961bba76e74 SHA-1: f63728a70f2d105956c6e8d04c53bdfd0329b42f SHA-256: b5938178ea8e8d0e1b1445538501b6c4dbf5876ee0d532a9f4152d4bf1ab52b0
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to these external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/e3ta70ag3ehtdf2a1487u86bp4/jiwikenunizifipotifexex.pdf In PDF document text
    • https://exlite.it/ckfinder/userfiles/files/winogiluj.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210903190328.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/fobib.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/zuxodosugojaferekiregesa.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/vegumirowidu.pdfIn PDF document text
    • https://topupdana.com/contents/files/kakupiwase.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161395a0e276b8---25079782585.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/99214571012.pdfIn PDF document text
    • https://ijp2.com/contents/files/zuvikofozixurunavujabus.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/99692263856.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/83429651438.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/takituwirejuz.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/7552905044.pdfIn PDF document text
    • http://edallyshop.com/upload/files/siluwusavo.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/jifawonerezivobew.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/88698590486.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134c53ea55ec---sirulitixezok.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/pifofewedizajozujekiku.pdfIn PDF document text
    • http://bubb.cn/up_file/file/molalawixavimozonogome.pdfIn PDF document text
    • http://technocom.pl/editor/file/kezuzawoli.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/60505830876.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/21248009702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=one+hand+mode+without+rootPDF 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_off0000cf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 17312 bytes
SHA-256: dc2aeb4314bcf1f516800f09fbc0cbf3b1a23eebc8b12a4acb7b78ce3055ee08
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 10508 bytes
SHA-256: 6c92c614f123c96a994f668afc7805e74ada58ab30082881189d007f04bfb597
font_02_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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