Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad59da39d86b093…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 06:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b71ba4e08512bda2a4772fc092d42b29 SHA-1: c0011776ae2b1cf912708fd8aabcff27b08159b6 SHA-256: 1ad59da39d86b093ad6a985768d214a3562772642399e3f391a7e8c430ee60ca
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, with the links likely serving as lures for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest a common tactic of using documents to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://crewmak.ru/uplcv?utm_term=wbcs+prelims+question+paper+pdf PDF link annotation
    • https://zivotzaokny.eu/res/file/bavazunibexepuja.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/63553954669.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c9f3fa1e2eb90cbd8032570eb8ccb2c4/84487882111.pdfIn PDF document text
    • https://dafelia.com/files/95875461954.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a6101164ea5a903fcf763b09478aae06/50495907888.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce987c244f---18604908675.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a306f9999a---72100482086.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/61973905668.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/18b52bcb9e178fbb376274af9279d3ce/82842003581.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/26177594382.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/16dbcc3337f44dd1fbb8218b2c6d08a2/89011952312.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c345a0d6c17---ladateta.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a78db7c1---kepoxamezusuriwawam.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5chek74nmbpfu1hsrujll5qftb/17753959753.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1463494aafd43446fcb72eca5fc2ce64/xonotexa.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/73109570538.pdfIn PDF document text
    • http://atya.eu/files/file/15811258929.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/48605487865.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2dd6e86cf---53758265909.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/8vl465cf4de6mi031er1m0tg38/bonalejivomuxi.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/24854817918.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/q8gbe4487gfcbantfjov64pua0/wexunisaxasupikixonivito.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/50674817238.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/65476456405.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/53709197773.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/53235157612.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/gawutinepogegesu.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 21732 bytes
SHA-256: 5c157e3cc561d28ec7e60e70c3dcf3122afd7acbec2855c1de81208574daf06b
font_01_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 11160 bytes
SHA-256: d12174b73cb13f1d97ecdff377749c44610a2d52592eaac7f3d90b846da54a2a
font_03_sfnt_off00014155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14155 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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