Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b56af784938fcd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 21:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67abe3df1c0605a2f48e3c4b4c73b273 SHA-1: 719df556649161af6c7ca65cc403d775fdb9b8cb SHA-256: 44b56af784938fcd9fa2e959dd417be4fa1bc95819b0f179167d8ea769a69389
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://naplesredeals.com/userfiles/files/59874175017.pdf In PDF document text
    • http://polesprogettazioni.com/userfiles/files/82068984382.pdfIn PDF document text
    • http://lactopad.com/uploads/files/5013334098.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/66093427997.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/92838787583.pdfIn PDF document text
    • https://tarsiman.ee/files/file/50390461910.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/vivimomawoweludexebu.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/xenotibazabofoki.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7156ee5b64e904886aa3b2bcfde18d2a/46242422444.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/53171324061.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/pokisove.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/81944748426.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/pijuloguviwomovutara.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/51229595878.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/zizibefijiletibubema.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/12462654865.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210914032550.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614352956c13f---64597173427.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/30655854526.pdfIn PDF document text
    • https://afayl.com/userfiles/file/rabujudo.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/86984674893.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/86821294451.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/sefawasasufuburujep.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/luvexikobizejapezabun.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/82537989195.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132bed7e970e---buzuri.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210915_BAD161E8506446F6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=happy+wheels+free+download+for+windows+10PDF 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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 10860 bytes
SHA-256: 43bb48a7783519b91940f04eba3945cf1e0385aba8f0351f20c5ff3e8652834f
font_02_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 16552 bytes
SHA-256: 48b85fb284a6e78c8bc9e54dae47d1edf8b1d1c74a69cc4c4b317e7b46b13665