Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c5eb1c3fcd9153…

MALICIOUS

PDF

95.8 KB Created: 2021-07-18 09:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e472f6b2b5e896610e9190a6d0bb01c SHA-1: b3f6409270d1ab037bf0b7ce0f030c141aafdc1d SHA-256: 21c5eb1c3fcd9153afed0fe3b508e2dbd31b7c427a2cc7479fad90562d8334f7
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, some of which host PDF files. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that the links are likely part of a link farm hosted on compromised WordPress installations, suggesting an attempt to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://artecgroupservices.com/imagenes/file/31535383587.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/fg35csg426cnfqf7dpcjh4i85q/14932716847.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ef5182bc30c2657d099e35ba61847e46/popubilafugudebepaj.pdf
    • https://seikai.jp/free_images/files/21920632521.pdf
    • http://akicgiyim.com/userfiles/file/jipikexikov.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c1120ba0---fowidivobosowinajiv.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f83160055---goziwok.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/fembu47ofi3arrbmgi5kn6lck9/9366716003.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e31a687b4---pewipibilojunuwenojogo.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7459678890d66c25a3bf9d6343574d75/82059769885.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b7b5ef43760c9b09d8bf06f98e2b61f9/sosinedijunonoda.pdf
    • https://planet-for-events.de/userfiles/file/25703425683.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da19a1e8c32---52397356239.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608979fe487e9---pijemidebewesa.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/01a18e6635c879b31a706be97a6892a0/51740574756.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5cf4bc4c---xarovodikalupop.pdf
    • http://timeyear-v.com/userfiles/file/kejikitozakowekokekimipuk.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4199ba14f74fcb00807ddc0704eee4ad/tagivabekomo.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6da990a0a5a8117e0604fd2f203e4cba/kadikezubatikijurewukalez.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/c1e88fea73396c0b6f27a7a46aa91535/zufixakexolugumofaki.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093af7b3ceb1---lulejavoxokesefajabilod.pdf
    • https://pakistanchristiancongress.org/userfiles/file/wisuxitudav.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ea019970c9ab0a4a362ce3d93b98f4b1/35580146117.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/viminemo.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f598f532e7---56092050698.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=greenfly+in+house
    • 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_off00011451.bin
47ee0d342e3fa1ba852ac6ee5f679c821038628298c8d778f8f5f80d0643ea41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 10304 bytes
font_01_sfnt_off00012b7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7D 16792 bytes
font_02_sfnt_off0001438f.bin
ede58c55ffcb82493bea5899cbbc0c8a7ef1cda11113901f32075c7c3ed983f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1438F 18952 bytes

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