Malicious PDF — malware analysis report

Static analysis result for SHA-256 728296a9360b09df…

MALICIOUS

PDF

89.6 KB Created: 2021-08-02 16:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f13373a6730678be7c50034e22f4dc56 SHA-1: 62806adc1ee6b3ac57829ea68935f921d2ede9ef SHA-256: 728296a9360b09dfc6c2f24278c17c4100b80bf74c6f329b312109d702ac08dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to distribute content from these compromised hosts. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/butvenom82eqk2ce9kmav4d6v0/36843550394.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5606caaf---julowubitoz.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2835f1336a4815d534c4b437c3abd4ce/sejububat.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/86425500048.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab161dc61d1---podezuxipoxijalolinodewes.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba3ad15f8---duwobob.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/kokadirikubisejini.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/4052af154a1f9e14a21b2b76de05a70f/kufavewiduwa.pdfIn PDF document text
    • http://katachizu.com/img/news/files/74170297579.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c014e7e2dd5e9de06d3a603620d5e787/gojikizobabetatowojutafab.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078564d0f483---jexekevisalelo.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/91431708927.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/49b79e3053eb4601abc59211fbf6b414/21273215140.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfd43ef95e---mitimijelefiwuxipemo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dbhn2mpg2pu5pjrvjbc1isgl92/61816067873.pdfIn PDF document text
    • http://artospace.com/pics/file/99934680191.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/26255540165.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/10723658626.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/57768857279.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/14138613205.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/utei2vp12epokufbvenjv1th14/81981352978.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d28b622697f1547fcd4c3e0ac1483195/sidetozogosema.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/6859002290.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6820ae8d9074b4e9117f66f35a393177/duduberirofevanokoz.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c752ac2db8a---30355056542.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107190705056747.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/57024557809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hp+envy+-+17t+touch+laptop+manualPDF 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_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 18052 bytes
SHA-256: 300c802f487be08dda4f220118412475f73bbe679a4366fa9f1b7bbb66b061d2
font_02_sfnt_off00013ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF2 10684 bytes
SHA-256: e8a35e2e5eaf47426a64d270a253833ab2e8a9b0de4aa4105d27688ccf9eed62