Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4d6ff4db7985e4…

MALICIOUS

PDF

91.9 KB Created: 2021-09-16 18:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b47b6671c303ed0e26ab2abcbe1b6bcd SHA-1: 9820d31cec08becc195593332b5b24554d03a40f SHA-256: ae4d6ff4db7985e48d47997c087d339a820964753a0cdb83bdfeb6d206c92041
196 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and an advance-fee scam lure. The document body is heavily obfuscated, but the presence of numerous external URIs and the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic strongly suggest a phishing or fraudulent intent. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://huntic.ru/uplcv?utm_term=boxing+star+unlimited+money PDF link annotation
    • https://anandamsanyal.com/userfiles/file/84035237873.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/49301135024.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d8caeb444---lilajemajadebuwoxe.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/78599902036.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/19524336139.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/xunamupi.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/pawatevutumorekelol.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/88757305029.pdfIn PDF document text
    • http://limoride.net/gallery/file/jimarifojubijazatixezuwi.pdfIn PDF document text
    • https://mbbs.hr/files/12528918268.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/puvufepininivokumawanafen.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/dozed.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210914191645.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/99034942873.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/67834835498.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/93902603204.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/54491323597.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/nomoloma.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25baefabd---finodozupivabimoj.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/23272804497.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/jomusomape.pdfIn PDF document text
    • https://gangnampools.com/contents/files/89183576296.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f443e2d2fd---duditilegokel.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/36669555851.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_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 10960 bytes
SHA-256: 6a68e7930a4053d5d7e6527814074e7fad31ff9ed162a21e6e4dfb1b32f6b171
font_01_sfnt_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 18180 bytes
SHA-256: 99154459702c0beb53fa499496d99f25b3ea4b5ca25c75795b0059f8c760d617
font_02_sfnt_off00014a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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