Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b71fc887889186…

MALICIOUS

PDF

73.0 KB Created: 2021-06-24 15:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a0b516458f2e5391f7c2cfa2672a7680 SHA-1: b015f864e9817f14f0f7947c11b99828886693ca SHA-256: d3b71fc887889186d179484296155db126bda024dec63d9cadc533755d0cb8fd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised CMS upload directories and the 'Password-protected archive handoff' heuristic suggest the document is designed to trick users into downloading an encrypted malicious payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a07fb28cc---tesibebowudugip.pdf In PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/252tlabd4ktco3r04e0g4aubot/1518363802.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/41266745983.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fasekobep.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/dabeterasixagazut.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160921f572e4fa---35980277305.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/salazapekusijomijamowod.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086967513c61---mejorewidi.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/96304915080.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/kulesejiderujej.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a148c510eb---fusebe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/39083261196.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/jenomopobosefuf.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079296ae7da9---46576964592.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/xodobezokudavafaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hacks+in+dragon+cityPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 5204 bytes
SHA-256: e94cfbc246f682c4733cf9eb3e45321ad540805a19eb67a627a1ec14123fc204
font_01_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 3448 bytes
SHA-256: f778d828d59a0f5bfea2a9a18f5cb76b9276f0aa339f6bfa2773c7ce2a9ee8ed
font_02_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 11720 bytes
SHA-256: de39d9f6c672949ef3428a69e8e779d00db88e64dbc493d9331ed165b57d8ff4

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