Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb522f3fa6595e09…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 10:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cda076d4b5549e24b5e7b0627dccd367 SHA-1: 1b8bcdd31958154c6aaeba46b4c5829b3aab6e2c SHA-256: bb522f3fa6595e09b96acf74a131046fe2431309315819ac06636ef2017de0de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=shiva+stotram+telugu+pdf+download PDF link annotation
    • http://grimastone.ru/files/69692974998.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/xojunok.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/82170511561.pdfIn PDF document text
    • http://mobilenmr.com/files/files/93939175704.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/jajawojugela.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/80807932480.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19fe49e2cb---xizeposogazokujidex.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/nufovezuvizofukibala.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/30012611832.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/61464353395.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb11700755---88835812902.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/lemimoje.pdfIn PDF document text
    • https://designclarf.it/file/70546058510.pdfIn PDF document text
    • http://ibb-online.ru/f/file/webunarafipanivutirifel.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/228806939.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/fb18bbe128bfb16dbc437764c8917f69/nelipexudewirojafizefuguv.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/8740213447.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ef753679224dbdcd846b461dff328712/dexobixokevosomozukumop.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/tazexadanepul.pdfIn PDF document text
    • http://generoussecurity.com/uploads/sesawajeberojutikokebakit.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/56360184450.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/dubazutifeluxoliz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6C 11272 bytes
SHA-256: 72b68e4bd1e3807b96a7a3ec2bb532ce0039bc8cc494950828d2e7c832dab7f3
font_01_sfnt_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 22208 bytes
SHA-256: 4e12a6d5a009c214494767aab582acd614c66aaf3af4b775176001c0fe5da5a0
font_02_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12618 16736 bytes
SHA-256: 22d21360ff3f4106712e78c54e914147b772dead44ebc0498ee7e18899963f89

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