Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cd5469318606e5…

MALICIOUS

PDF

74.2 KB Created: 2021-06-29 21:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaca31fb32765a27686a09d2be0bce5b SHA-1: 905ff79231b04f8b7c68da72c60d2a7915d99ff2 SHA-256: 10cd5469318606e54b8e4babc22ed12ebe132f83de10b738dabf2ea92902f824
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting domains, suggesting an attempt to distribute further malicious content. While no executable scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://nmcs.ca/userfiles/files/74114357769.pdf
    • http://ridendo.cz/files/file/42040882896.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/oee99etreqqddbm9f2mjo3jcna/69247734687.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/8iivvogof0ofbmcnjvanbmssm5/riparikawujaf.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/532f9de3284331fde7f5214deee54d6f/3398502518.pdf
    • http://datavincity.com/uploads/ckfinder/files/40252920982.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/42a203a7221b6b76949c90ca4fbc2a8b/88518376364.pdf
    • http://karpatskiles.ru/store/file/fuxemupugazadeb.pdf
    • http://kccmaul.com/files/files/14012246162.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c2118273---rimuxavesilerivakajij.pdf
    • http://jikaramen.com/uploads/files/valasogisizugebebilogem.pdf
    • https://cakenepal.com/userfiles/file/tezuzigotufufusopom.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/519d4dd020dfa344fc23f37ce6145a95/76828634214.pdf
    • http://tnslib.net/userfiles/files/salimo.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79d38e877d---5200827442.pdf
    • http://fdscience.com/UPFILE/userfiles/files/13750648269.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb3fbd4bf7---48557082913.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2e5260f63---javutomarepuva.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e95aee9670f4eaed2e097f27188faa53/74953150997.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/53svnbplljsok05jl7s4u52rac/52041940908.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ed5enpn0pri1djn9fjpibllufm/58143032401.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc19d651cd---58247848139.pdf
    • http://travelshops.pl/userfiles/file/41005318661.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83614d6f2c---67697725645.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/74b70c990fd0d0ca83620cf4ff796a01/71485232483.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b224fc66c7a---82845878195.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/76044709156.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=microwave+engineering+by+annapurna+das+2nd+edition+pdf+download
    • 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_off0000be30.bin
1365c499b7529c65b987c3390ecb10abf2bce1383bf20ebbe21abc8d284e4604
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE30 16104 bytes
font_01_sfnt_off0000e7bd.bin
c8daa5c5bf51de0d0e476e19c684e281694a842845f6e1fcd28b0df528df5651
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 11412 bytes
font_02_sfnt_off0001028d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 16792 bytes