Malicious PDF — malware analysis report

Static analysis result for SHA-256 94356d28251d35cb…

MALICIOUS

PDF

90.1 KB Created: 2021-10-10 07:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61c05cf551b0bbd90d4bd1a73211fbfe SHA-1: 9cf1fd8f71cfb405502c3e910c6d782b4855122e SHA-256: 94356d28251d35cb35b630328d3bd572547c8a36c45fea58512dd00cd79dd48d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://1472bond.com/upload/Fckeditor/file/38253624841.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/85942822950.pdf
    • http://zenhowell.com/upload/file/kasananetowupudureva.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155c382b0a56---vekowajovavakiwikimuloxiw.pdf
    • http://redskap.ru/userfiles/file/veboxekovawelujabowo.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6706e0b20---gepejufuwe.pdf
    • http://keitbg.com/images/files/95668020082.pdf
    • https://sieuthibongda.net/ckfinder/userfiles/files/zexum.pdf
    • http://automsystem.com/UploadFile/file/20211003200452542.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/l08ovf0r5q2fme1o48073opna0/12572455014.pdf
    • http://csc021.com/userfiles/file/20211010102656_a1she2.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b736e6f2d1---ropegifibo.pdf
    • https://merlak.ru/userfiles/file/71689530600.pdf
    • http://redskap.ru/userfiles/file/miveviziredewoturipopib.pdf
    • https://arslanemlak.com/E/file/
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613788e2c059a---79164021500.pdf
    • http://mamam.by/upload/File/file/bekunuwabefolaxeg.pdf
    • http://ibtaker.ps/userfiles/file/kitupejob.pdf
    • http://carbontuning.ru/file/mekotonelawakimiwe.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316d7e63278---wazewiregopagetonidep.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556307d1012---pogom.pdf
    • https://laznia-radom.pl/userfiles/file/97987659357.pdf
    • https://deitratech.com/userfiles/file/pezidigas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=class+6+science+chapter+6+question+answer
    • 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_off0000faf4.bin
fc4fc961bbcababeb430f4f81efd05c2765c8f9960bc042b1da726d26af5c09f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 18008 bytes
font_01_sfnt_off000128bc.bin
382947226a4d3bdc1330602fa9bad67cb9419e69f668b1f0bcb97ccfe211ae77
pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 11000 bytes
font_02_sfnt_off0001424b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1424B 16792 bytes