Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ec9091283cb916…

MALICIOUS

PDF

80.2 KB Created: 2021-09-25 10:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bf6cbc753366d96df583c6c6c8e02fb3 SHA-1: 70f5f216046be214e88236210ef5062d2b0daeab SHA-256: a5ec9091283cb9161806553cffedb988fc1ca296456e4f5874179478ccd85576
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=db+super+watch+online PDF link annotation
    • https://psihodesk.ro/ckfinder/userfiles/files/zibaba.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/pokeraranemosivafofosudox.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/97703384960.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdbdcc24ee---kokokubevefapovirubudu.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/33128966084.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/66548702033.pdfIn PDF document text
    • http://eternoohydro.com/d/files/pidufesavep.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecaadad438---takijikete.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/povalagudefaku.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/38905165964.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/88084377881.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/tigokojumuripoxo.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/8432371883.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/98600815707.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/86102537393.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/ginilem.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/jkrv3bvuksu5lunjmjehsm3u8j/nizamidatepiximad.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/niwekuzetukukijuziwal.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/vuwupake.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/84320840176.pdfIn PDF document text
    • https://777mto.net/contents/files/31919790706.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/09e3f08518fd29108cac5eafafd6d57e/5758065691.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/ralejizijutufazifofozupa.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_off0000cd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4C 10800 bytes
SHA-256: c21289580f25c5a964c8e0ae3d4d0d605d4bfdc2c7e7bc7a30831163534e6eae
font_01_sfnt_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 19608 bytes
SHA-256: b899783c557a6213a20001b7775cd4fdf0b1575789cfa325dd67a6b8178e85c2
font_02_sfnt_off000119cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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