Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a3ca657e1a9d2d…

MALICIOUS

PDF

115.2 KB Created: 2021-09-06 04:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e613aeb5b3a358fd07063b3268b258a8 SHA-1: 4601debe8aa34fbcc8f584b1404184925521d9f6 SHA-256: b6a3ca657e1a9d2d81a90b633c1b9ae193aca6748482569670ed544f1f5316ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. Although no scripts were explicitly extracted, the nature of the links and the detection indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/numebazetaw.pdf In PDF document text
    • http://superfasttv.com/uploads/files/pedotit.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/mifibivojokofiguwivet.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/xevev.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/74848067190.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3a8aba87783278e976c7cbd72b345754/6245263953.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bef81f0673a6ebc9cd8ecd6bc263e43/52111062863.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfadaa81e7---31931710183.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dudonibe.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/nomixesorixemi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2218c767f---20294401614.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/gegodalogufigezeg.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/913702ec68d8eddd5ecb8a23256f0e96/85184284667.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/84792a2b88ca4da485154915b850986a/82078274058.pdfIn PDF document text
    • http://abwessex.com/uploads/files/81148690423.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9dfd56d43d2bd77deef51ecb5f93182c/6866418177.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0361e7e6a---jolitafe.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd3e69bcc---64403684634.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/318816a740180dabefe298e148d0fe6b/nuwajevipimug.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/rokogoxizujirifarovuv.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/zoluxigat.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/batugovokezaba.pdfIn PDF document text
    • http://cissi.it/userfiles/files/lutuzabikisewigemewa.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/tivobokofak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=assembler+plusieurs+pdf+en+1+macPDF 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://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_off00015966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15966 20648 bytes
SHA-256: 25a6f88ec5425b000d17e3dca0e4bfd62fd8cb754c0f90fc544b55991af88999
font_01_sfnt_off00018bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BD6 10836 bytes
SHA-256: f335b3b5ef720c7781cd1d13fcd9826030e18106645979a1914906a36e4a5ca7
font_02_sfnt_off0001a49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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