Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e3aa1960bf462d…

MALICIOUS

PDF

80.4 KB Created: 2021-08-12 20:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40b116c35543277dcc52f6764db69189 SHA-1: 1906239da5a67da5cf9cd191567d6b7e87816176 SHA-256: a1e3aa1960bf462d8bb97189d6ae674fdaa57f3c620de2ef26dd5f4cabbb726c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, and contains numerous links to compromised WordPress sites and other domains. These links are likely used to distribute phishing content or further malware. The presence of a link farm on disposable hosting and the use of compromised CMS upload directories strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6314

Heuristics 5

  • 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
  • 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://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c256e47608c75c6a31452961776ade69/nidizamo.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c1cb631d09c44e9cfef986d85a3c8ef2/9879364907.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/51744273041.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/55475017931.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/zibep.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/60024786556.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/puxafi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/055698fb3f7d378bb87e66b12c237891/4223199049.pdfIn PDF document text
    • https://kopari.hu/files/file/riremasomigobun.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/70720930287.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/s8qfthfhbf04o35e460smobc99/kezefuvudipovivuvuw.pdfIn PDF document text
    • https://o-dance.com/upload/files/susosesuzuxemal.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/01393c2385471b5b626fb67433bd429a/29311546630.pdfIn PDF document text
    • http://schubert-hh.de/image/file/duzagusumofapipaguki.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/34610431333.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/42538601877.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/jifitepuduxilinib.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/11788418508.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/16218254971.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/16157105326.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/63f4abcf49a15ea0e8e1c55157142d58/36600981742.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ce5e2137---desusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=como+montar+cubo+magico+passo+a+passoPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/123730fa5dff41b3f98c44a10ea722d0/vetepejegadurubifivaxep.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 10812 bytes
SHA-256: 14cddfc51128fbc2ef0535a13bb948d5c341a95c5dd722d9cb92a6e7163eefeb
font_01_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1