Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5a00103e7a6ddb…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 16:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 539e29f0800da2bd26fb16b21f2e6582 SHA-1: ac14feea2d51e094e407a4e3ffb008c42a12a10f SHA-256: 1d5a00103e7a6ddbed22129d0fc71954428a483a806d36b0612417465489ca38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3e053e2b1ddcd2b1e54b6c8aba46a29/54699948556.pdf In PDF document text
    • https://venus-forever.com/image/files/26679481554.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/bilemekidelesipufu.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/25167991935.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b5e749b8669f2e7ef99d12fc3e387df5/zojagivelovidam.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7d0de15e---63457444772.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/07821121b7d2242a3eef19210a984ebc/kalejujarudapez.pdfIn PDF document text
    • https://okazionche.com/files/43646067257.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/11230838887.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/72118791224.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/darozuxasapibowurudun.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/fazis.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e7343e5e7a89395d35ae8fbd50454b58/watadij.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/578ad6d505ae89f5f980b4ae13d082e0/pibenozuxuve.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-24/20210624173552120697.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610868a294250---9030279796.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/q6sg2jf83rl6ln9s9hb04rophd/felakimajo.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/4880064006.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f8a69eaa31c25f3f7de637c78461d190/joladimarogiratupozesofud.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570b0bd928---82107949564.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/585bfa547e344e8cefc978e7c9183190/kudokojefusakako.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/kogevejizumurotilezadire.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/92e08775a627d27926c34d7c38630023/82162789904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=damage+control+resuscitation+pdfPDF 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_off0000cccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCD 11064 bytes
SHA-256: 1fc0f8ea7d0bbdc84a8ec5a969073e25ca41f0fb2b5fb0cd435021c26f522e8f
font_01_sfnt_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 17176 bytes
SHA-256: f42ee402171f9c34eb42c4c2b20abfea155e3abfcf8c2cc6bd209060c50db8ab
font_02_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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