Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a909c088a4c888f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 01:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1dbf96df55e3e62aeb18144b2b5f8581 SHA-1: 6137fc851fb81268d42b899c8013227f2f544e73 SHA-256: 3a909c088a4c888ff0fe22d4371c72cd037795c6cab6efbefd4c7743f94eb452
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://gewald.ru/content/Files/xakexozozujonamopaxitu.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd476861a9---31708075995.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf665fc0e---nisisatesi.pdfIn PDF document text
    • http://accronline.com/userfiles/file/xapaluritufuf.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/43576304220.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10bb6c0b1---26690804515.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/50883109048.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/j0bbjc8rnietq7aniihbcvc468/buwuguj.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e74d1d4f---70312682576.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/658de709e815db6ee41267f18b2731d1/kenizimefalix.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8747f4c090---46064502336.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/93728404966.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/39618919982.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/55290380106.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a916bc2a1---44800959989.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/1mkb7ocs854jcajopoe18njms6/93310201772.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/mojikirorifeba.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6906bfaeae43ea5c2d1d1247147db299/91210895704.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e631ef00a1---87194994395.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/84240605720.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/24942512293.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/87dd17e9e6d128c4883139b25ce4977d/ramumivutubixiligevutes.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609e763143fb5---giroka.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021072401474573499.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/praub23i1g7s1qk5q4ov56vo9a/dunojimomumuwedanuduf.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607275500d604---77007841270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ariston+water+heater+100+liter+manualPDF 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_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 17948 bytes
SHA-256: cb8a5f8f65119f85aea4735f6cfde9d564c72f90d90e2ceaf44e1fc66db6e026
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 10716 bytes
SHA-256: fd10a3d30aac9962d53ab66e67ffff60b63cf0b07451496efe105b2240bf785a