Malicious PDF — malware analysis report

Static analysis result for SHA-256 7113877dfc269612…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 11:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e32e529e5bc66c2591945f1f7106e19 SHA-1: 3bddf838ce7f51443496de9246c8e76f094d6455 SHA-256: 7113877dfc269612ca316f590170f961715f2dc7bcd74433a75940a2f24b487e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a phishing or malware distribution scheme where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607544b1f2906---wadalenuxixiso.pdf In PDF document text
    • http://lamay.de/userfiles/file/zazikewedidom.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/36853592443.pdfIn PDF document text
    • https://etimes.mn/uploads/files/dovobuwobifugaf.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/xuvomibiwiforepadukinida.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/2062567187.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/wuligekaluxesilirumu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e014558fe4d76fa4f38bfa8e9acfd471/wisofivugorinuv.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a6995bd30e13bb9df937ca71bc99a78b/jegimemezujoxaririd.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/zidaf.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-23/20210723091154803664.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/gawiraxobisuwejawegul.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/matotamowugox.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9f8f8207e51213f89f5940cf7f02129d/jososonixafaluxivanulid.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/somuketofivufepuginejef.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/l9aa9j6s9bcgvbb5o1ndbll533/97188966333.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/38867745561.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/be9594b6c7f4c1cce4219cf0c207eba9/vofejupivaripe.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c1eca91d850a6573fc068aadd18845cc/jadoboxagutalezu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7a13cc3ad52e083ce01f1faa2767d9cd/98514141711.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/goxoz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c686601c725---vunenimosod.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d50feaee8---41911091868.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/uqr11l0nrp94l14pctqrnph808/jeviv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=computer+shop+business+proposal+sample+pdfPDF 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_off0000bc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC36 11032 bytes
SHA-256: 0f6b87b19b2722dd86acde5c07916d589accc82630d054eb4d50a204a93f1612
font_01_sfnt_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 15432 bytes
SHA-256: b9d755811b9c4072b6575b7950e9359d1a66b89a90c7118c9b78f2dc658050fa

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