Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabfdb31625b7bdf…

MALICIOUS

PDF

82.4 KB Created: 2021-07-25 08:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 198864feba2ae82afde6cda1a79b0314 SHA-1: 6ab0ebd889d1288eccd54890a1091d8c0c9a19a3 SHA-256: aabfdb31625b7bdf5e6d2dcca30e505b1fe4abefab2995d6aa013165d7ae01ae
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through deceptive redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://agendatourvietnam.com/hinhanh/file/xofedoruki.pdf In PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/501417a1c5c7f98190bdbe27da71d107/jaxafakonogexapeneviragaz.pdfIn PDF document text
    • https://egf.tw/test2/images/file/mapememuf.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f723ed2196f578c56c290488dbedf595/tikim.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/xugafo.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/35096257386.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1268b3a93de2b5c80a926e33d5240659/99207823492.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/e5ugo1c60b1ejt9t5kibbs2fcn/pinavunokozinexufuxijaka.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e132f9bff67---konodutije.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8f0068fdc---wudedugo.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/xuvubenowibevunatumilowaz.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/kagazajutusamotamogowi.pdfIn PDF document text
    • http://enricobarraco.com/files/45215666793.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/27500022863.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160705acfa95b7---jodusab.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/zoritelizagazirilubuvomil.pdfIn PDF document text
    • https://digireg.cz/upload/86687016476.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/lvdbo0vap2i67135dedltfg6pu/vutolafuxinewem.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/kovunanafomaz.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/88513295638.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106202332274288.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852f47cbc34---taxodiferi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cell+cycle+and+mitosis+skills+worksheet+answersPDF 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_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 17376 bytes
SHA-256: e6709d643573faddb4c0fa0a7fac6a26b435156b74a45caa738f43558af68b5f
font_01_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 10956 bytes
SHA-256: e3fa5caa0841e2ec1a054792959c6e13d35e342c64b81a6f060bdf848a167f18
font_02_sfnt_off0001236a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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