Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc230c5a9d168af…

MALICIOUS

PDF

111.0 KB Created: 2021-08-03 10:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cada7edc1af0aaace08971c4e3f077d8 SHA-1: a5d8cb5c3c273b7cec487ba4c93ca942dca46ec6 SHA-256: 8dc230c5a9d168af6305f7ba4a422126f99997cc1a80158971729bbee96d24b1
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, suggesting it is used to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the extensive use of external links and the high ML score suggest a malicious intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=alfabeto+en+cursiva+pdf PDF link annotation
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/lalaponubifejegisefiweli.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec8dc6fb05---96967091124.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/7110171618.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4caa51bd3---7933371633.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ecc111e209173a4d23f05d08a4e82d7d/vewug.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/lavopetu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca554c398d---zojeretajugoxaro.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/8e8tqrgqvk7hfmgojknq46nnot/nitolidufol.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8c64e6c05bcd12738737a756d0a51627/68999562914.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/74757644024.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/58528829254.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/57414900993.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8904201a3a---jevejurok.pdfIn PDF document text
    • http://regcureguide.com/files/files/wexadivupofig.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/43a9e53fecff8438662e23a60099f751/tetukudekukuda.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/jipodaletogenibakewaj.pdfIn PDF document text
    • https://htchninc.com/d/files/82012012068.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/23784004744.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c60722327c61ae85531daf3454a1dc75/39457182569.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/978fb88c3a1ad631cfe594d6ab987f65/jogasalipamezorerupo.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/fesutukexalipo.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/xixaduzofofopasufo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d26067803729ffb3ece4d5775a20a948/wigoradadesaruraneja.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/17341907490.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/96679050255.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 10900 bytes
SHA-256: 385b4c947d2508d97867df2abb5a0b2bccdbc92571d4743dcad8401e345f1977
font_01_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 17340 bytes
SHA-256: e6027d8de7e9b09d834a94186150eb7243e3dd6565cbac35d0f3dc1244e2f37e
font_02_sfnt_off00013aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000152dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DC 38616 bytes
SHA-256: f8eaf19f757e93b6f1484a02ed630ad83ffc4a963670671e27d2e523a65492e0

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