Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb9b2b6473f5757…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 07:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6709f7b126838cad90e2be157a9dc01e SHA-1: 64db46a92a425d8fd3282a4201a5f7d8d3f9986b SHA-256: eeb9b2b6473f575704f2f28251808cbde6b90e85d4d89b5f12b752ad9ea0e7d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs point towards a phishing attack designed to lure users to external sites.

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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/dfphj1lm1ab6hg8fur41hm5f9e/vosule.pdf In PDF document text
    • http://pathtojanna.com/userfiles/files/79271329707.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/65531770940.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/5552000310.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/luboguvefuk.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/bazizuwama.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/kegejawaviguwasa.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/xowebesabekofejuwujesewub.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05ca98c66---49098849744.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/suwovuvuzujijudosuxu.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/mumakotapubimijawaxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368ef9cff5e---37673511617.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf2f623843---watumesipexotubovidobo.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/gekubidajefelib.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/32647783317.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/letufu.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/berabebajejevutigadiwiza.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/69343636577.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/74501780547.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/vonoxel.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/44603470870.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/nopagafajekijilukajepexi.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210908045806-dilivej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cytus+apk+full+unlockedPDF 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_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 18384 bytes
SHA-256: 39e3f05d65eb65570e78e28d310148cce2c62d167f9ba5ae48125e1d51fbbe37
font_01_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 10756 bytes
SHA-256: 562a1e9aadc7d5b11689e298252d834d54f5ef3d30920f4df45f5a02944530f1
font_02_sfnt_off00012be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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