Malicious PDF — malware analysis report

Static analysis result for SHA-256 f163d13ddde315ea…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 10:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 809ac6ffa97a0fc66f8495ca182d3a34 SHA-1: ae20dd889a68dcfeb01ce6bcb9f2ef1131924552 SHA-256: f163d13ddde315ea75ef6d80267cf6d8a8d5439b59da1489e4f1a6cda2950d77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely phishing or malware distribution attempt, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://advantagelic.com/singhania/downloads/file/lolepad.pdf
    • http://dtjxbpzx.com/filespath/files/20210921012045.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613728b364001---80723345065.pdf
    • https://gibidesign.com/fckfiles/file/tamedelajamojek.pdf
    • https://noticky.net/akce/fotky/file/kefizenelamowedoj.pdf
    • http://houstontca.org/Content/uploads/files/logatet.pdf
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/84270264844.pdf
    • http://www.mattig-accounting.bg/fisiere/file/35232863788.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf5f21a62---52226925461.pdf
    • http://mrspk.com/ckfinder/userfiles/files/zokebe.pdf
    • https://lbjgold.in/ckfinder/userfiles/files/kojibutaki.pdf
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/67550783444.pdf
    • http://pileki.com/imgup/file/xitokefate.pdf
    • https://nycsmindia.org/ckfinder/userfiles/files/45294897502.pdf
    • http://hongdanhaudio.com/luutru/files/29814931560.pdf
    • http://sakulchaiplace.com/Uploads/file/20818372105.pdf
    • https://maribon.net/app/webroot/files/userfiles/files/nuloviwudurevepigokam.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9a9a186cd279dbf2b441d23981af72ff/nakidaxuzesituwuwunev.pdf
    • https://aaaxxion.info/images/file/39169113567.pdf
    • http://hyundaiokla.com/uploads/files/12492613660.pdf
    • https://pinyardim.com/calisma2/files/uploads/85543227376.pdf
    • http://bbfederico2.net/userfiles/file/16759399138.pdf
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/ladif.pdf
    • https://emmaushuis.org/pages/gerilefewajavenilube.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gta+v+mobile+2020+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1c0.bin
84c4fe97e6aba477136af9bc50eb5a451c423f3017ad2de1a092fc177fe80a62
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C0 10712 bytes
font_01_sfnt_off0000ca6a.bin
de386f4fa78e2c944335d5eab5e8a201585f3245e3413e5b3b340d3b033aa239
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6A 17440 bytes
font_02_sfnt_off0000f727.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 16792 bytes