Malicious PDF — malware analysis report

Static analysis result for SHA-256 0078f5383ae42a69…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 01:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2f6826c5f5cd4e8c2de488173a8c5316 SHA-1: 71d94840606ddabc0847dfaf9ab43d401ab52916 SHA-256: 0078f5383ae42a69d5b7fb4fab715fae2f8c94ee60b02f8c6cb57622c66793e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lpkgoodframeupvc.com/userfiles/files/77756945290.pdf In PDF document text
    • http://beastyenergy.com/userfiles/file/gujokolimisiwules.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/61156331099.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fee5fdd372749db25aa65aa33ab88f9e/nizuxokodipaxa.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e07deab24---komemasijataf.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/luforoget.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/xorirademo.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/33607984694.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/54454226606.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/70502859117.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/kotefupeberixazuwaledega.pdfIn PDF document text
    • https://ibericadearmerias.com/file/getixalupanezepadul.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/67726863268.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613666b80cc1c---22859899706.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/jujilipidadejuvages.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/muberodigaguba.pdfIn PDF document text
    • http://101balkon.ru/upload/files/kapunoz.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/jegivadof.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210904000308.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/66673712240.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613027d7c3736---pemifewokorurajerex.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f544a8f104---59658048479.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/776095592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+note+4+usb+debugging+not+workingPDF 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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 18104 bytes
SHA-256: 5860a31131a7fbd2cc96d22988bb845d66a0b74829bd8fb173f8a7485ebe1c51
font_02_sfnt_off00012106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 10924 bytes
SHA-256: e451580c0c94d0b83b1c7f939e046aba17d9d39ad8a43cd61abfc5df06ee71d3

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