Malicious PDF — malware analysis report

Static analysis result for SHA-256 7484d80794d29dae…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 14:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a540c3694f2fcb286e63ebc09719f355 SHA-1: 7142825820c36e5d0c8c3d64cf9512a9556869b7 SHA-256: 7484d80794d29daed36fdaac0d58bccab82edacc2d1f6faa155f3dccf5c2364a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yds-wcv.jp/free_images/files/73402782915.pdf In PDF document text
    • http://qdsenfeng.com/data/files/pazibekusu.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/totibumasodenokimepilop.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/67226174600.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/sewowareronemefalarelowit.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/lonowovuwumiraxutusu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b002dd3c21---tozuta.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/luvulij.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/sudiwijunagopop.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136abc9c6e78---bevajuvuvorova.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/3048166744.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613cceb1523fd---febafupibe.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/molitelimem.pdfIn PDF document text
    • https://producto.works/userfiles/file/552063777.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/ginosodikizex.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/lixixalalutuwewo.pdfIn PDF document text
    • http://akademibt.com/resimler/files/21243048684.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134459ef1dfa---gikosibo.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/61577296680.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109170747359308.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613480b8c5301---72035780880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=abou+ben+adhem+poem+themePDF 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_off0000ad82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD82 10472 bytes
SHA-256: b1d12e88a34a589448b8cf1001c9dcd7299c2566fdebfd317e1a65cb5dd3adb2
font_01_sfnt_off0000c4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DC 15196 bytes
SHA-256: 0601eb79412057b10976abd69f3055c1f1d55aef926cd83a300f0d54880408bd
font_02_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1