Malicious PDF — malware analysis report

Static analysis result for SHA-256 083e0f8aba99f667…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 01:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9a99971bec391088f185cd2ad0550ed SHA-1: 33545c528844628bb2c61fa5f4b71ca609e71c5e SHA-256: 083e0f8aba99f667b6362fab626a763cb1ca6409203c9e09514c9670e4d2e710
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=about+decision+making PDF link annotation
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5d4187705716e860c650204ef909ba49/17529746656.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a736a70f201---dozopawajudotobedidado.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/mukov.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/xoniliwed.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/jefosunefefopubaxira.pdfIn PDF document text
    • http://www.heksan.com.pl/file/litujudazi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd5021278---zuduruzusug.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99bd75692---govaloni.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/vevurigo.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/feretimivizezokinisiwo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba85afeaa9f---panutelenibok.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e2a42864---13622199153.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607882ca0c07e---zugigiki.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/16668e2694f6169cbbc504a4f00f6d58/robukoxaja.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/5264864264.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/20623685723.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8239918d34---pubaragule.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/jaxod.pdfIn PDF document text
    • https://rosycaffe.com/file/12540319772.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/rexiguxizonimalosubisila.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/gafelelapesokabekagipifuf.pdfIn PDF document text
    • https://majubesar.com/contents/files/54301953257.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_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 10880 bytes
SHA-256: fec4fb244ae7930cc2d36494ffd66766621ca9d5d6d48609e579b0dad525d2f4
font_01_sfnt_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 17680 bytes
SHA-256: 141598cba420dc8149b66defc9c61ca4039c6a741e54bdbcd085621c741c9665
font_02_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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