Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2433cb98f0bb2d8…

MALICIOUS

PDF

77.9 KB Created: 2021-06-29 05:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 82d7d777c87ceb1840ea67ff7637ab0d SHA-1: d7fece68b875d054f7631b4371266d3e0d99c0ea SHA-256: e2433cb98f0bb2d81b93f0ccb7a5a4a0af67272c761f66ce00e4c44590b6d4d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with malicious intent, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a298729682a---juxijus.pdf In PDF document text
    • http://xiaohecollege.com/d/files/52173305194.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/92809f04ef2cffee36501d710e731bbf/25625749710.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160789cd99956b---68439069466.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/125ba81bbc90bee1a74a7437ff5085d7/vidurekidonunekekadil.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/jelupugodalop.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210605_1EA598AE5222747F.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/witovokinub.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/12207086569.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e65f6f32e1d5d1884936783438bc383c/20719081309.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097441002b59---86773883848.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0beae5c36---32387537496.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/a64052552467fc81544126ef9946fc5f/sapunafuzu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/1438476548.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddc1d6ccd5---80857867004.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/84140d3487237a18df154f509396c8bc/napirekerovukogalufafe.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773da45eef9---mebamaduj.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/didegarorebowunuge.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9437200285---29317520257.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qpr9srk8h8c9qash19j36tc02t/devutenupoganalenilurev.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/jasidar.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/71a1973f06b8f3c62547f98f0c441351/kerowomano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pdf+viewer+for+android+downloadPDF 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_off0000cd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD74 10236 bytes
SHA-256: 0796f4e9e9898b69beb5553014bd9598196ac555e651fe73ec8d26d71a5e0304
font_01_sfnt_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 17596 bytes
SHA-256: 5960e973b62bc6630e85b818ea154309e349c1571040007f6fa5b0bd33288928

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