Malicious PDF — malware analysis report

Static analysis result for SHA-256 17930d4b62898151…

MALICIOUS

PDF

76.2 KB Created: 2021-10-12 13:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2cd1e1581cd4d5d904e78a7c7aa1f9e6 SHA-1: 4b04b4f8e198ff3fef8edbe06e4b0b93a39cef05 SHA-256: 17930d4b62898151b899d2887a170a06a0197f9da8d20ac9b555b8ed47f2cecf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://allytemp.ru/uplcv?utm_term=electric+propulsion+system+pdf PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614f102c1114a---kasofupejuvutonolijarak.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021109351166386.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/fobepobozuwemirowaza.pdfIn PDF document text
    • https://kristinanamaste.eu/files/zewofomabuwosi.pdfIn PDF document text
    • http://yuhongzg.com/d/files/62833681766.pdfIn PDF document text
    • http://pactolous.hu/upload/file/4029162594.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-4/20210904145254291219.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/746r4i8s9mt3l5h7h8j3mg0ev0/digusokelinuzor.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/zobemabimofovaz.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/42914429365.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/vitivabutasi.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/ketobiviwokalorimunojufu.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/bukexegifigi.pdfIn PDF document text
    • http://albachiara.info/userfiles/files/97135851055.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/tatabusikagusokebe.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/82257344727.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/be3ad2208dd6eda5889d8424dd521028/nebutuxaliba.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ca9c20889d---wemanep.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d48b168bb5ff847a29d92fb1a6b599d3/sarakufozosigibig.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/lirefujakipefuwawezewid.pdfIn PDF document text
    • http://jump360.co/upload/files/20210922183004.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/30259219783.pdfIn PDF document text
    • http://excellent-art.com/userfiles/92492848279.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/felitifirexuxifu.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_off0000c674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 10816 bytes
SHA-256: 36e8d7fae2dcea758620c8252e7f260ea5e7af0460dd60356bb30df01333f3b0
font_02_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 17316 bytes
SHA-256: fd5e160ecc79aec144ff76e4740c0c38bcb9c88e50e5765ed9260f64c636f10c

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