Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36c8f1405f530bd…

MALICIOUS

PDF

87.4 KB Created: 2021-07-05 00:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdbdf171b38788fe6666ce2222a1403b SHA-1: dd1c1d8d9c9d66b24b4e94f26bce8e73d2f81456 SHA-256: c36c8f1405f530bdb5b019dccb2a37d95067e3873a35bbf32123affde50b3e2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple compromised websites, likely to host malicious content or phishing pages. Heuristics indicate it's a link farm on disposable hosting and points to compromised CMS uploads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f31199732---12976894917.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4a857288c0e5289e3424751fae057c5a/78516261964.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/247b10dacfa3825ffcf73fbddaaa1ec2/75595434367.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/t91qg2knv0ree0fmth71cimc4f/dawunubujawi.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d70793fb8---wugosoduw.pdf
    • https://aquafilling.com/userfiles/file/21306133173.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f6badd96---70984619470.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c1fnfugstq40burb6siu0h0du1/37816715188.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1ea2b0adae6256cc7cda6fb86c446a11/zijivolesekunarorawigid.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1400930d60---bokibit.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9pj38gv7aet5pehr59a5frk0li/33019906164.pdf
    • https://zzarosiscarampola.it/file/63454882742.pdf
    • http://mt-filtration.com/uploaded/file/188812039560c4ec960c804.pdf
    • http://terezmisszio.eu/files/file/85155240072.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/zowilirakuxe.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/916a50055553b85557b1e7f1b7bc8312/63051195536.pdf
    • http://thietbianninh188.com/uploads/files/78348354628.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3e6543c06e6a81aa6863b46a5d1d68cb/xejiraleze.pdf
    • http://albino-pitti.com/pub_img/file/20722002237.pdf
    • https://alexandrapanayotou.com/web/images/static/file/53604173727.pdf
    • http://royalgoodviewresort.com/Uploads/file/xojuweriz.pdf
    • https://maggies-handmade.com/UserFiles/files/15482726088.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=famous+marfan+syndrome+sufferers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 16792 bytes
font_01_sfnt_off00010bdb.bin
c22d7766d567b1b70f366dd93409cb00cfc03246c093462fc6be1a0833f7e585
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 10472 bytes
font_02_sfnt_off000123a2.bin
04180b5c604b0509f21077ae7e6b5d3c90da88ba9ea66f84c3c450e5fcff47cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 17188 bytes