Malicious PDF — malware analysis report

Static analysis result for SHA-256 b399039771f9ae10…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 16:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b4708bd0a343001b82e86f5c873dfb0 SHA-1: bdf0a938ee6b32d65194ff3e46599562648cf624 SHA-256: b399039771f9ae1012a03df3627973eed90fef75fb75d1445c5d47dfcbca4a8d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised websites, likely intended to trick users into downloading a password-protected archive. The presence of multiple PDF link farm heuristics and a high ML score indicates a malicious intent. While no scripts were directly extracted, the structure suggests it may leverage embedded JavaScript for redirection or obfuscation, common in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mountmoriahcamp.com/media/13937956222.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614b002787ca3---55655759445.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/67831494968.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/fagaxajida.pdfIn PDF document text
    • http://iviltra.lt/images/files/61088958303.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/61410978963.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/70431319889.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///84079596958.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74dbcc9a0---11771078627.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/18587327912.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/vanatotezipej.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/36533356706.pdfIn PDF document text
    • http://usateatop.com/_upload/files/12276142081.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mjft1ajc6acvvsfamhh5k4fpqf/90672789324.pdfIn PDF document text
    • https://electroagro.es/pub/files/27332328436.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/83082178055.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/vanabej.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/fazajibirij.pdfIn PDF document text
    • https://clubon.top/uploads/files/2575498679.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/352328110.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1963989839613783c58ea0c.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/nowuxaranijadaso.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144beed15cbf---27205884365.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/62086268918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+scan+qr+code+from+picture+androidPDF 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://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_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 18092 bytes
SHA-256: 9a10e36bdaa9b4bbeaf9bd5ed718c4b8de43ea976ae7419e036341604117ad04
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 11056 bytes
SHA-256: cbc302ecd957e4d669e97736655c811b30ca9c369aed8a0c44190ca84098c54c
font_02_sfnt_off00012645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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