Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3daa049b4b36b35…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 02:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7865330f8a67571a51ce9ad008ab5010 SHA-1: c3eddbf8dff28df4e0b36512db4ead598d7f17d6 SHA-256: e3daa049b4b36b3531fe3459f86bc9ac0ba85685dea8a37bd9c8814ec6320580
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document used as an initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=thulasikathir+nulliyeduthu+mp4+download PDF link annotation
    • http://boden.boj.se/uploads/userfiles/files/76317029916.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/kamikoxezijajinigigula.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/bejevogadiduga.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/60874114909.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/71874719196.pdfIn PDF document text
    • http://labotinnghia.com/img/files/mosijesuze.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/88937309715.pdfIn PDF document text
    • https://webhosting4.net/media/file/jusiru.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/23132681438.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/64407791981.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/mematosaxa.pdfIn PDF document text
    • http://dezis.ru/uploads/files/rutopo.pdfIn PDF document text
    • https://angkagenap.com/contents/files/xerojemivapisituxekaves.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b114c5fb2---69990145827.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/selusutegapajigon.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614658d6c2ebc---mewakubeniwevezugejon.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/7931152533.pdfIn PDF document text
    • http://soles2walk.cz/data/file/62854332682.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbe2b61572---35128196066.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/tisekubuzodek.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/98154105371.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/desaruxegi.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_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 11088 bytes
SHA-256: fd0f23671072f441dc6fb36371a28a5b0dee9b8bf17d09696492c2866cd65b00
font_01_sfnt_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 17900 bytes
SHA-256: d053b477647b905d2e50b82b820d04f9e1a3139bf8229bfb5facdb1596a16ed1