Malicious PDF — malware analysis report

Static analysis result for SHA-256 54115cd01dbf7c35…

MALICIOUS

PDF

70.5 KB Created: 2021-07-06 13:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7607e0a2bb2ff0b8011ff61b32886345 SHA-1: d65a1dde4fd4d0cca2ad39a5aba9ce89d74a411d SHA-256: 54115cd01dbf7c35e72b7cf48d58accabb19b2de35d75d06821830a445dc9c3d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to lead users to malicious content or phishing pages. The presence of multiple links to compromised CMS upload storage indicates a deliberate effort to host and distribute further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a669bbbe---40367081402.pdf In PDF document text
    • http://amexeuro.com/an3_Uploads/file/bozufakesafugogopab.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ced05564f---fupuwufaxatukub.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/wokazupabukilawigazok.pdfIn PDF document text
    • http://inistor.com/ufiles/files/lefigolatowabofusexokiza.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m8jmdgus10r7juecnbtc2v7g6s/75120383250.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/917edfb1afa06bf40c4edb60f05969e7/99161209606.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/97796604701.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/63403199216.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/82429447741.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/1640865100.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/70679488321.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608969f981744---bidomoxazividukogebelovil.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/bufebibadageg.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/51809075457.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/93207738893.pdfIn PDF document text
    • http://millecolori.it/images/file/jagilufonodox.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/363d551ab799c78f8c0d2f1ec9e3c47c/pukonaxozaj.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/bpr767psrc6h6qihlgps8rkqg4/fidavegugov.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/91990221449.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/824dce3d4ed9764a76a782f0e6b4a76f/59435521220.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/45014523151.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/19375811951.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rlcvolg8l5g9ffmj4k4bi8rd1c/24641358891.pdfIn PDF document text
    • http://abc-tel.ru/data/File/redofufobogemuvogokajos.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2ea8d0e7620158222448f180c5e60a18/64051435208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=98+ford+explorer+sport+owners+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_off0000b4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 14172 bytes
SHA-256: 877984c5b06d452973480fc93ebf8889b9df5cbbe5f8bb9a5710a341e523f3dc
font_02_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 11132 bytes
SHA-256: c2fb7be15ed5b87e5d784d4df1d14112670db1fcf9246981d166120dc7187196