Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efab199b611794c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-15 05:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebd9c9a8621c8301a063d5673b150d34 SHA-1: 4934cb6503f242689e7d0dfb75ee1e456dc31e65 SHA-256: 2efab199b611794c94576d4016012f089406ce2bc708958860bda92a5b5a4716
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=how+to+install+viper4android+without+root PDF link annotation
    • http://abwingsbuffalo.com/uploads/files/41816524447.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614085cd3df37---9133987566.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/tedabap.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/30771971957.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/fobujemo.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/zelunilovovilirukepe.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/miruzemotajovolezopoxig.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/91109911539.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/dapusaxirovu.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/vosuxoxirufoposofazi.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161413f2fe11f6---55122949951.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/3507305330.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161412d8a3f587---66396397438.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/xuzenexofoteb.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/17335983821.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e05f6144b6---wuset.pdfIn PDF document text
    • https://ferropula.hr/files/tonaxulitegupewenetagig.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/mosolagaj.pdfIn PDF document text
    • http://klenderbio.com/upload/files/bukuzam.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/fovubejef.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/towusamobupewugige.pdfIn PDF document text
    • http://ipceurope.be/assets/file/24859880970.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8r7jdm9jsjb881q3r97s5qo6k7/16976964005.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_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 19524 bytes
SHA-256: eed633a5c22ce40c4b65caf28340da59e7b89a414e386c183b09d10b71d8b793
font_01_sfnt_off00011a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 10808 bytes
SHA-256: 0655aa2eeb410834bd82883fbfa6707d8877d6ea6df73e16fe9f2cfc68dca973
font_02_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1