Malicious PDF — malware analysis report

Static analysis result for SHA-256 b502e3d0c5b1a5ce…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 11:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 199ea722a7b92186f0fc4f000aad25f6 SHA-1: e8e9d17b6ddfd6b55458086af38d99eadbce7cc8 SHA-256: b502e3d0c5b1a5ce0a48302473f245c6868f6a79af634cf18462f8b94c46d6ed
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These links likely serve as a lure to redirect users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cmfnepal.org/userfiles/files/80254648512.pdf In PDF document text
    • http://congluc.com/upload/files/12087516696.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/91208787847.pdfIn PDF document text
    • http://hkalc.com/userfiles/58051980668.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed04a8eb52---piluruxipimasor.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5973ef274---totepetavobim.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/5574170370.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/53929463448.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/65107823672.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/fawewonugib.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/74710795374.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/xobawejojewixex.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/fitalole.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/xiparisogurutot.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/14054440335.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/23885873612.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26018737781.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/88147002901.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/tewoxa.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/23899402496.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/17624784653.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/wofoveto.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/durojugodokusetawikiboko.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9f69d6bf7ea9dc584a90eac4813e09b8/gojori.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vivugugumikebajufifaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+run+windows+software+on+androidPDF 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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 16760 bytes
SHA-256: d516c9686b1323ab49f2e4d16e9b67386d26b257adf62e5362ba8e90336a55f9
font_01_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 10476 bytes
SHA-256: 9e9cc5d1d1c30ba0bc3deec11bfdd04810252dcfb7a2c2695b062628e89f2dca