Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c563c9dbc9af26…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 23:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18ac5a44a25904f17367fd87f0fbe867 SHA-1: 933cbb7da1030d7c7dba9490287bdc048e65a3b2 SHA-256: 17c563c9dbc9af267a51714486490720d5a57a24340b7f0be94253a44db2850d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to obscure the true destination and potentially distribute malware or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cobmedia.hu/include/raxosepuvifesorukugate.pdf
    • http://pjteam.hu/uploads/zafinutubukotokilezo.pdf
    • http://rigassprotes.lv/uploadz/file/77135190788.pdf
    • http://dietaltop.com/userfiles/files/83463600829.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/pizovapi.pdf
    • https://suthuytinh.com/app/webroot/uploads/files/teguki.pdf
    • http://hidropro.hu/upload/35101875603.pdf
    • https://stehovani-ostrava.cz/static_pages_files/file/80843750903.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146666a6ee00---29298048629.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/77101982065.pdf
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suxamowox.pdf
    • http://cedule-plachty.cz/files/file/gularabodumev.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5e272bfb7ae53b5f19f0438c5bd86309/folujasumanuziledupel.pdf
    • http://posekatzahradu.cz/files/file/pupejasaduxezutaba.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/60703923704.pdf
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/xitakekojopugani.pdf
    • https://sunrise-photon.com/upfiles/editor/files/xobibimalemewopu.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614635abf0db8---67400909406.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/10652140803.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/buzinewuvawezenubi.pdf
    • http://hoshitorionline.com/uploads/files/36882169535.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143be0a23e67---jubadezaruj.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/15414906009.pdf
    • https://vonia.mikludava.lt/images/files/83461203903.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=view+sd+card+files+on+android
    • 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_off0000af4c.bin
3ce855943070b37642dbb0b36422e89b9476170016b879ed2b9273fdf4d174a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4C 10424 bytes
font_01_sfnt_off0000c714.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 16792 bytes
font_02_sfnt_off0000df26.bin
215f110d25edf931d61774f66b5a8857fb4459b48bc01bfe3d11ea2d6fd21808
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 14628 bytes