Malicious PDF — malware analysis report

Static analysis result for SHA-256 150b856f8d8cccd5…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 21:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b7b8221d539c85e5ce873e8bf3b7941 SHA-1: faa41434094a38f734e7929ef14794d4f59e53b5 SHA-256: 150b856f8d8cccd53c7419dd09e3969e51a10cdc5340f2457c4abc2cfa272d06
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, likely serving as a distribution point for further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a tactic to obscure the true malicious destination by using many distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://bogelaipigeon.com/upload/file/dopexopezazojetuferi.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/53887319345.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ade88970d99b54cd466f81320ffa171b/43196981023.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c54b691d1849c1285b8a636948f25499/wimidafapebusagemekezim.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wopadug.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/pumodoxipisaxinedeziv.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/h9omnjtomref1l4hl0dv06u95q/6649742568.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06fe4e9d0---fewatuvibulitox.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/48686695080.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88262955f---76480606070.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608886e880986---futokefuf.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0860477c76---5241725406.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/nodobugolaxali.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/xixos.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/tawagokekagatowon.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160743c9e9567f---97751367519.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-18/20210818134636608242.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/46500319689.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/65964972769.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/rezave.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/nufugesasusinisobut.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608083467bee8---nanoxekejabevevexakoma.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/wunepugibogavenajasijefo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609be61bd40c9---22130472646.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608548763fe7e---vumasovipilokugisewepuvib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=be+around+the+bush+meaningPDF 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_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 10940 bytes
SHA-256: 36ff1a85e3d58dc6c921986970ae91cd7470d55bb1b58c892b454d50634da147
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 17332 bytes
SHA-256: 73ea535aab5cd512a14ba04e2f65bd32ce70e978fd9debe528d862c74ad8ef42

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