Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2743191992875b0…

MALICIOUS

PDF

88.7 KB Created: 2021-09-22 17:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16f285fe2e791e7863b71b95913d2c7d SHA-1: 6e3868b8242ac835114171b0b76428112ec6fa1c SHA-256: c2743191992875b02f8fadc105e45d3087cfbe4a83463607a8348232295f6187
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed numerous embedded URLs, many pointing to compromised WordPress upload directories and acting as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4066

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 https://infrive.ru/uplcv?utm_term=zootopia+full+movie PDF link annotation
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c89bb462d---gakimigo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acec02ca29---velasopajebalexiwozukeri.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/wajedasapabunitogatok.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/zatesilirakiv.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/kemojowaxe.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/33269130127.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/80184808499.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/nelob.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef01ba686f---83969521925.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/44731507750.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24661717440.pdfIn PDF document text
    • http://weingut-suppan.at/files/12932988909.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210901050338815.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/jivanesap.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/rabiforokaxus.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/3804000136.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/9032674170.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/tojevakoxusif.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3779dfa8ce4b4cbe3a1c56e6910d2a10/93392125698.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/61938701073.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae11ab8859---gilofivanam.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210909104518.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 10276 bytes
SHA-256: 2bde0a9db2fa5e334cb487005ea245d2edfff421e64eaacabb9bfd84bd3e755d
font_01_sfnt_off000129ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AD 17820 bytes
SHA-256: 5f0d191bb4f79a5e6e40f696c8dcfbb3f5051f81ecbeccce33b2a8195f887237

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