Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d233436441dba4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-23 05:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7ab30c72049558e737c9bfb06ec2e24 SHA-1: e4102ceac1f7255c11952cba32282517a46207d2 SHA-256: b5d233436441dba49d0f07c304adb509ad0008244a4e8a933cf3589b5506cdbb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm designed to host or redirect to malicious content. The presence of numerous URLs, many hosted on disposable domains or compromised CMS uploads, strongly suggests a phishing or malware distribution attempt. Although no scripts were extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=android+battery+booster+download PDF link annotation
    • https://myparrotfood.com/user_files/files/gobatananuxivixozanebave.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/78191244561.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/52975757250.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/ratimebosolaxak.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210908_D3E8A6CBC310E218.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/sipaledofoxuxupigi.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/pekejawanejo.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/disununafaj.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kemosukalumajewaduzan.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614099ba7b7a2---fulokuxonor.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/87382868592.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d66bdd018---xomiruzevibazimido.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/kigumuberej.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/dojebovinaduduvuxot.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/42459875787.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/2968322624.pdfIn PDF document text
    • http://e-sheremet.com/img/fividugemufozirexi.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/sixitala.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/nuwixaturividiwupexonilof.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/filadogugune.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/sikakideverineviwikax.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/jedetuniko.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141a23b73041---35611763805.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/13697583330.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/46974224758.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/devetupurerofaj.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_off0000c0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AF 16100 bytes
SHA-256: 92fc7d2d3184229ead92b2c44bf983fca550d50fb3d3d0b2aae2eeb801268194
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 10564 bytes
SHA-256: 6f9618022d5ce095f1e000ba9e6a0595ed24804f15586cbfc9b3ea41e696f82f
font_02_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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