Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d3ddd50acafceb…

MALICIOUS

PDF

79.6 KB Created: 2021-08-04 01:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5a6b08d444f37081d76c6d764afabbf SHA-1: c90f2412c38c131786af6e663adbccff20454bbd SHA-256: 43d3ddd50acafceb00fb71973260af1ece121147485019574d6d252955f32e77
124 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV with a Pdf.Phishing.Trojan detection. Static analysis revealed that the PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2523

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://juha.be/_files/file/46517408910.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/deruzowamegeromuwolaguvo.pdf
    • https://xtrafitcoaching.com/www/images/files/mepopunabekugadukesekowuj.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/23853956079.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3e308bfa353d0dfa4bc0166f0bfcaf0b/vunanumikaxom.pdf
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/lurunizefarupama.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e915f1e28ace6754a784f93c492eb120/71465004841.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/jikowud.pdf
    • http://voijin.com/userfiles/files/98334807944.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/cabbb11a82c666f6cc0ad9ff1573b106/tabekiwo.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f20247f2---napajanutagidiret.pdf
    • https://kristinanamaste.eu/files/97155616739.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/efa200e93de7beb6433acc45cf43a18b/68642191176.pdf
    • http://szkolka-wiercioch.pl/files/file/27524662547.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9ab2daac---fotajamibevumutirenotamin.pdf
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/92518790066.pdf
    • http://jrpst.pl/userfiles/file/folapunefabufiremu.pdf
    • http://ridendo.cz/files/file/kovafofotigeg.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4138dee277---sojabikozek.pdf
    • http://chukguwang.com/files/fckeditor/file/jajuneji.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be585e3af---87467163276.pdf
    • http://cpspcb.com/uploads/files/9397302806.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c25ebc562---nexeguzeladadugemegonabe.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4f8a94e1---90306473874.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c67d9749df6ecfc68a96b3d2df4ab09e/zikakezifulotifozok.pdf
    • http://hzjksj.com/images/upload/File/zupegaririg.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987d05264fa---davozegeridobuvinusim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=inductive+and+deductive+method+in+economics
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f344.bin
b93efb887666871bfc5718e3edbeec40dcf53940db57a857f34fc94dbaadf41f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 17320 bytes
font_01_sfnt_off000120c4.bin
19f7908632c90f0fd53b215b1a3102ea89a69edeee85e4e210e15aa02567d2a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 10608 bytes