Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78d52ac43fd3027…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 21:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68391a243321768301455a1f8a5f48a1 SHA-1: 9f7fb3cd72f90250cb03da3a7c934725b31dc436 SHA-256: a78d52ac43fd3027978f562164c3d875b249acd109c8f2bf5e6c22ca84c4cbee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF acts as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b72b2d4326fd5a29fb612d7e1e9c69b3/32642992591.pdf In PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9855bef100c4a3dc9c624ccb5e9caf06/juburek.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/rabasenunuvawuteruwodewu.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/68777538278.pdfIn PDF document text
    • https://slide-bearing.com/d/files/55038366042.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/59204196341.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210905171156.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/52321596864.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b33931b3b36ff94ab3485dc4798263c6/towelij.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384add93c1f---limegasi.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/defulonabanepula.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/98604309132.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/300726136.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/89572548169.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/bekaserokosokobizawaz.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a6fd2a893---23644352148.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/nurumutesepewajedugo.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/xusawobodojugatiramisitat.pdfIn PDF document text
    • https://maymac.info/userfiles/file/69578463296.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913054956888075.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/3674014331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+save+a+pdf+file+that+cannot+be+savedPDF 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_off0000b960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 15412 bytes
SHA-256: f2e64c86c89fa0e9627819d1263d46ed931a45438be46ccb8db240865d938b54
font_02_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 10900 bytes
SHA-256: 4b62406e9bc8bd3b749c3d27c5b099c482ab4b7048b35d748a7d61066a2a80c0

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