Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea08ef13fc0bc5f9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 06:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d26f4d52e3a1dae0ee71b580a5dd407c SHA-1: 52fdad1cb58ad9b08b8f55a19c19a7ddbbeb8af5 SHA-256: ea08ef13fc0bc5f9cc86cbd71e72c3bb257b6a3782a133124386edf5c61864b1
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social-engineering lure, instructing the user to install a browser extension or update. This is a common tactic to facilitate credential theft or malware installation. The document contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=once+upon+a+time+in+hollywood+streaming+eng PDF link annotation
    • http://zrdb-drogbud.pl/Upload/file/90246095575.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bj71t9l5ke80vc30ifogqo1n1o/31150736083.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/93800114896.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614215a54bb04---50964355010.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec590a7b00---49121369661.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fdbfg52vr6osfb8k4rmuailoqf/vabaritusazetima.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/10376786509.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/nurekupamuzilose.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/53589576939.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210914_BA1869D9054EF518.pdfIn PDF document text
    • http://prmakeup.com/Image/files/53065107673.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/puketidotovimazutev.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161455d5d7e719---rirajivozejiniwoda.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/65331670791.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/92112113096.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9c6b507e19f5c064cc40af64baf18e03/34643791304.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/mixari.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0006cb79a---xebizeduxo.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/zubokewedogow.pdfIn PDF document text
    • http://inistor.com/ufiles/files/25966333495.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/28076916863.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210910003634.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210910023711863965pgix0.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_off0000cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 18228 bytes
SHA-256: 70cc6e3ddaa2dbc222464e16c071b01306e23ab5ca4d43cccb7f7d621c9ded20
font_01_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 11284 bytes
SHA-256: 10841fb481107f35e662a014d76692406cde59903d1f924779c7ba2155b5f393
font_02_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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