Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d43e2b0db561bc…

MALICIOUS

PDF

124.3 KB Created: 2021-08-09 13:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0fe53bd52733e88453c52246135c519 SHA-1: 01abcaa38f5998db76e3db8b7579f4f4edba0259 SHA-256: c4d43e2b0db561bc97741385d5a363882ff1a8c6c4504e5c91e44764bfa139d3
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://musthighschool.mn/ckfinder/userfiles/files/vesapobiwufimogex.pdf In PDF document text
    • http://jakpaisanestate.com/images/upload/files/xibomugew.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1d3dc469c7d7a700a9f569fe88f48b19/44746547881.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/56061524369.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608418a267b4d---jokagezu.pdfIn PDF document text
    • https://digireg.pl/upload/lepogudiwapigefozuwuj.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607323761c39c---losojanimelifujudage.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8cbb01aeb0a1d23780308e6b356edb05/kuwazexurakutakodivedej.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210701094943.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/nubotejemivakube.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/76055039692.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf6c76592---mivokimawuwo.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202172575473072.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/73701510180.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/jigif.pdfIn PDF document text
    • http://klinok-saintp.ru/files/xulow.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16100eb20d45fb---23861691580.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/55770638620.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5b0cdf5638de9fedcf683e1b77f8ae05/loxoregoguw.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608038fd534d2---13164845076.pdfIn PDF document text
    • https://wecareprogram.org/images/file/dabawofomorob.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6abacd1f0226dca89f4ca088ad81dee0/75040485508.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/debejibalosuzivawu.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/bonawulewibo.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210530080637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+are+group+7+halogensPDF 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_off00017644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17644 10584 bytes
SHA-256: 34b2ab46a9438b7b426d7cc4d5865b72cba3db2ba00f77f94e9c2ea62b811fa3
font_01_sfnt_off00018e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E7E 22540 bytes
SHA-256: b2c55068791bacb2e6294de6623fd0d8fa931b14481f32edd2f97df157c5ad5f
font_02_sfnt_off0001c8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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