Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc4a3196e35e338…

MALICIOUS

PDF

87.2 KB Created: 2021-06-17 12:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4ebcd54fea765e1b32d02f28b7f0b6f2 SHA-1: 1dc26c9983c6045322d11a5edeadbbc0015e100c SHA-256: 0cc4a3196e35e338089897c069f4c6ac7e88e7464132409052aceb437b8bc8d1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farms on compromised CMS uploads strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/19691c533b8cfde612fd52d94c4b288e/waleze.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e6715993---wixiderefa.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160933eb5b04a5---91221821636.pdfIn PDF document text
    • https://baptistfriends.org/media/95042352039.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eef2da353---30533176263.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/xabajepomozikubamuza.pdfIn PDF document text
    • http://bio86.fr/fichiers/69612238332.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/94901327880.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/83625862759.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/dabebe.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7556d726596d0da75342ef48586b335b/vipuxaxemuxivomopunem.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4ffdb42c4a516236ebab552c8cf0b32a/79510662080.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/kajit.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/79615c29472328c03be061ba274fefa2/midunipik.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/7289034703.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/63772354392.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/c19c5dafdf1d23098a3108df9bbb27c1/lafezi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rnh21r0s6ttmr0ja0plhuaa9e7/32884479064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+paradise+island+2+mod+apkPDF 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://scripts.sil.org/OFLIn 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_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 5392 bytes
SHA-256: cc60923c7c5c1013999fa0cfd574b97d389ce68aae8d1c701060076f2932a4da
font_01_sfnt_off0001060a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 16608 bytes
SHA-256: 624b5d4f0004f9b7ac86fecc2473595944c946c1f26a2c0d83eee2d89b550858
font_02_sfnt_off00013953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13953 16388 bytes
SHA-256: 0d24e14f0512e766c179b44cfe8499105a03a0514e0cbd55b91b2b5f2155a1cf

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