Malicious PDF — malware analysis report

Static analysis result for SHA-256 9820d0b00e0d9782…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 01:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7fc1a24c2a3ae65786890b3a3f9573e5 SHA-1: 9cdfb67148976690218fa82a9ead874247c2c835 SHA-256: 9820d0b00e0d9782257e589bf5b6c7d43456ec3a0b4215269d6567f1635605a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The embedded URLs and the nature of the heuristics suggest an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://crewmak.ru/uplcv?utm_term=house+party+game+uncensored PDF link annotation
    • http://hflbdq.com/uploads/file/162256403595.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/kimeg.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/pegude.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/11854642062.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/26376762891.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/81434524454.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/60884051584.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/zizemomu.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210919051728084.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/32280548406.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/mawozemavozoke.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/89121148649.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/zowufamoraw.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/warubemavigesojokujitadip.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5bf60c443bf5438a2ab0071265ca9f26/sapiriruwuradazikoko.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/84748891684.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/78527176747.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/24b4b8d27ddd354017659cccd806c620/didazafe.pdfIn PDF document text
    • https://hirurgija.me/files/sofafewusevixodumujunawag.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210904192600.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/21376077948.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141277aabbfe---59323556217.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/52916475065.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/wegokapiw.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/wepikegodarelibepimaten.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_off0000aeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAB 15952 bytes
SHA-256: 02f85f7d6fe777ff031fdcba7a269047a86667508eea0f7a1c99ac60961e2aa1
font_01_sfnt_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 10924 bytes
SHA-256: 38ffb7be2dceed3d64780e9c34ca4899a48a82d99e89e5a0904a0fcdd60590fb
font_02_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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