Malicious PDF — malware analysis report

Static analysis result for SHA-256 9657c05791d956e2…

MALICIOUS

PDF

107.4 KB Created: 2021-08-12 07:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cdb8011db5aac96f0f6a98ab4398a6a1 SHA-1: d732a1c3f31bdb93b2c682101d4339d6c4fd20a7 SHA-256: 9657c05791d956e2e6c1a73127e5dbd7058322a0d87384dc3cf0104cdbf467b2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, 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 presence of multiple compromised CMS upload links and link farm characteristics points to a deliberate attempt to host malicious content or redirect users to malicious 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 http://madonnina.info/userfiles/files/12040605055.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d9b32233196148259dff9fd72683228c/mutarapof.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/71216227410.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/7586469492.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/mowojawako.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1b4899556---80590682836.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/24952762139.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/60196328200.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/mafemuxiledoxuv.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/98959774830.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/fodeguwodijumedikuli.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/mivafigarezakavexiwegidu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b906061a6a---46335808377.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/xiwinizujur.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e01vob5364c2ifdv7b74b09oj7/wugabalemobeduk.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/85146522164.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/75718998657.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c58469bd909---13158624615.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/mupuw.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089715fe9d82---marelifopaz.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210802_124322.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/pefobefunezomoxozusefa.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/91170556123.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/jodumi.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/35388703231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=libro+de+ambiente+y+sustentabilidad+uanl+bibliograf%C3%ADaPDF 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_off00013806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001501d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501D 11072 bytes
SHA-256: 8f90e43f138a7f28385ba8c84d5260265aa617da95b2653d451ff9534fa0b7f0
font_02_sfnt_off000169a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A7 19696 bytes
SHA-256: 73e8fbe62fc9fae04b9182219b91a5cf43a33ed401d309db57a36d60a36c23a6