Malicious PDF — malware analysis report

Static analysis result for SHA-256 90111e67191e3f87…

MALICIOUS

PDF

81.9 KB Created: 2021-07-30 09:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5ea9c5c28af6844288fc292c7986f94c SHA-1: ac7e57b2555c49061e6addd80fa84d20da0ff6c0 SHA-256: 90111e67191e3f87fff26ac200d81bbd0ce0740e9f1de822be37b7d3c84dedda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites or appear to be disposable. This structure is characteristic of a link farm designed to redirect users to malicious content, likely phishing pages or malware download sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://dearbornshs70reunion.com/clients/c/c6/c6cacd1d9512a3effe7244eb89d69e0e/File/72596103759.pdf In PDF document text
    • http://dsagco.com/Upload/file/82966839556.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/xikivakegutilaxusure.pdfIn PDF document text
    • http://elitvorota.ru/f/file/kazuxufup.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/41629625015.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8d113b9cefe16574144a76fd287da950/timiwiba.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609873b8019dd---kimopir.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fukkgl01riiosihaoe7nbe9eo6/vuwejazo.pdfIn PDF document text
    • http://jarosi.hu/files/file/41859463671.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/kudagikexakamu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/97f4ad7e221c793582055298e6f4f094/61452362052.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f26370e822---wonenasifamazerepimurafop.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/eaf49127f9a1a5e52839ddd551fc0ab7/xitevetu.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/60567557008.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/43118934608.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079293cd4ba3---90469966781.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-19/images/files/tavawimemofuzawuzitu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a995972565e---75885531212.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c7f4bf3fe---bowuxumubanojunudukomowur.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/85766140683.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d5f5e9e22---64970814995.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/tdo6iik6s8mf8c7sjjlte7h0e4/35352692155.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/zomenikazefovulazoja.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b2d432556---fikawiribepurom.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076024ae730e---zemodipewudumewoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sharper+image+laser+tag+set+instructionsPDF 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_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 16940 bytes
SHA-256: 97ab00d579c8102e7cd5317e0f1d255c471536ec56f92ca269c1c4dbbe1f5072
font_01_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 10996 bytes
SHA-256: 97393055fc2bb02b8e54de54e0f72d85d52649c145a891c07ccb11e65a0babd1

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