Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0f6a5e81269d39…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 01:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57ef35a97ac8a35f60068ce4f16d5747 SHA-1: 20752cc77e397dadb4f80adce2859e7bf581b340 SHA-256: ef0f6a5e81269d393c343a0c3757f3f61582b5f7f65014b3ba2bd3ed3a34104d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of small PDFs acting as link farms on disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification further support its malicious nature, likely serving as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=1377x+proxy+uk PDF link annotation
    • https://discovery99.com/userfiles/file/70030554486.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f8c6cfac91e5f1a4f87da2ff19fa35ac/23280760127.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-7/20210907050231289419.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/70968059974.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/katasinakanosepigapopu.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/40011402486.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/tesibaporetapo.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/rowanifawudegupujuru.pdfIn PDF document text
    • http://innotack.com/userfiles/file/84118443759.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca7f3f889---83729745733.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/powemiwozikifurer.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/97dbc9a9ef37d2c853aa7ff5aea3fb99/vixopaxulede.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/nutuwewol.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/posolosofu.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/55886843281.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/nejejotukigexura.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/radabizid.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/kuponavozomas.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/pamozowiduluti.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/67639192065.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/tumukegivekuzimepebun.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/jupabosatar.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/lagabad.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/71512879510.pdfIn PDF document text
    • https://breedlife.com/upload/files/44756899684.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-2/20210902110256497931.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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 10028 bytes
SHA-256: 2e8522c8044354908be80662c7373bd2e45851d3e1eac3f14f91876be5da5b27
font_02_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 17520 bytes
SHA-256: 6d127976d6897fecbd85db811460d0ca0f5cc2d5cb0dc474f2d459fcbc55fe02

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