Malicious PDF — malware analysis report

Static analysis result for SHA-256 b999911aab431e27…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 16:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b34085255a9c0cbb23d54500e8e6e1d9 SHA-1: 2d51e1f079e76699de75431eec0529112ab67dd3 SHA-256: b999911aab431e27612804444f927269f61ceb85b41ad6d075d1f29fa268f69f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=affairs+cloud+july+pdf+2018 PDF link annotation
    • https://foundryindia.org/userfiles/file/benopuriwulifafizusunilos.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/364e10de6595d41cce53479be37db6c0/33584079541.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/nipozofudanegegevone.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/temupoluba.pdfIn PDF document text
    • http://boursemoi.fr/userfiles/file/59298888116.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/21318827530.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/34965034276.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/sejimu.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/78325430093.pdfIn PDF document text
    • https://successalpha.team/upload/files/53232908610.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/29826741342.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-8-14/20210814064218662753.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/91324794062.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3f99e8b78---butaber.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/44428019898.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/12ffc353565519d523604f1261add0f9/64019106407.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/wopevutef.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/3833850198.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/18253951647.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fd5fa109a97db391052c1d710bf4fbd1/64314995995.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/jinetuxunobuzajujuwabuf.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b58e9792---23027387172.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/sonawunar.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 11108 bytes
SHA-256: cf279d893a1a55f5758d6b8013040de9b99bb061c61f59919ccc85f9ac4f6c68
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 18024 bytes
SHA-256: 4da9b66e94b48e4903d4ab4036947d9ce346b8bfa41c569ea5fe7b2b9c300d04
font_02_sfnt_off000127de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.