Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bb07d68aba200f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 05:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc8bc3af2ef6e7da6d88258c137f1b41 SHA-1: 7581c68cf8b63760939647c72cc734ea3906840f SHA-256: 71bb07d68aba200f6a6b44e9f82057ce4a9882630292021a930d3f5275e8cf25
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of JavaScript points to potential execution of further payloads or redirection schemes. The document body was unreadable, but the overall structure and link farm behavior are indicative of a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 https://laborke.ru/uplcv?utm_term=glossary+of+economic+terms+and+concepts+pdf PDF link annotation
    • https://hgindustrial.eu/userfiles/files/jeneroromuxal.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/51383762989.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/55o7089966es59ldgele9t7tj7/50589401873.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1fa63452da---mivefexakodoladotobajak.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/25746584847.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/76232226627.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/21ba349ac5da32d879021e6a84af9471/42719312850.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/jipil.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a6674134ceef2c74cdc8c2ddbdc26a7b/mekiveji.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c7c700c7e---vowixax.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/konadumu.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/jumeragoronisoxag.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/8666cb8c5c90f363465e5d9ad6219a21/21205994160.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/2081383465.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bo2riqifjtrdu3e3eea4gmeb3g/vuketi.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/73207394568.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/gem4k2sv8uqr4miutfj1ipu1qd/jiwenazowires.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/68329575220.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/61428918101.pdfIn PDF document text
    • http://fkhd.cz/data/img/figobojuviw.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e5984aaf---63376245621.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/80998336194.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/28305e992461f989993741cb501c87b9/58799457482.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kokububasutudupa.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/27704589435.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15A 17544 bytes
SHA-256: 0627ee0038e29995b944d3af7b606434eea26e79780cf944ce98e70894d712de
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 10936 bytes
SHA-256: 39e609a84f909bcab6c7c3ffde681889484ee4cb34644a20d7aa890fd2a86909
font_02_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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