Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e9158233d7abcf…

MALICIOUS

PDF

85.5 KB Created: 2021-09-10 15:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8430dd6319fa6a445578dfcb3cf7aac SHA-1: 88732b4e6e4c44fc2d942570d6fa44f8758b5fd2 SHA-256: 84e9158233d7abcf5bc0c81a2e050639fd2a4df7ea2c003e61cda765fc20221f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://synerhu.ru/uplcv?utm_term=over+her+dead+body+full+movie+online PDF link annotation
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/kigiwedim.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6df15f81d44175c90fee8929a3b2c56c/bomikejo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613590a41303a---roredul.pdfIn PDF document text
    • http://edituj.cz/res/file/bufepegikujer.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/sidopumufonelafunap.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16311347371283814552.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/86169917384.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dg633fvp5loii030gbdbucgt04/12232448251.pdfIn PDF document text
    • http://tid.vn/upload/files/22664627356.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cfbf6d283---domolujekipav.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/48601537210.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/jolitonuzapumuw.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/37322194404.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutemulokufulodezixo.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/tidusemaponimaweloxa.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630981166.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/lejaxanusiwux.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/5849483161.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210910110534.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/58595634641.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/66707590358.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/luseropadaga.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/legalusukuwawusumura.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/dagowu.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/vubutadupuluf.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/87353827998.pdfIn PDF document text
    • 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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 18624 bytes
SHA-256: ae303d400fc0b431a26922cc669036b502ba627d7a69f23d3423a6e3b0a00567
font_01_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 10800 bytes
SHA-256: 66cf2354665ed1be0418f8955a7ca22d1a882b9e7c61d291b4c557d54406e088

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