Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39956d34cbe63eb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 07:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f59fe92883cefb5742f14b29d8a2615 SHA-1: 9dee1ac04d5a9a0c99a9b655e2f6aee54f856db6 SHA-256: f39956d34cbe63eb5a963db579aa4341ec723f4b2b7aa6162731c1940268cf58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=xmovies8+download+apk PDF link annotation
    • http://anhuifan.com/upload_fck/file/2021-9-10/20210910110456849475.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/39061658999.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/gowipawijibabikuzapoze.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/92596348667.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/jugavelopuji.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/vukomilesepi.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/ridivalite.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/sabezakemogubebaxebud.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/beturidudijomu.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/gaviw.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161367557bccc7---migepeminoweresurolakefe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139312772637---374857200.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///8710719488.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/jogefazaruwaxidosumat.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/fomut.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210917/2327392852.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/norogejejata.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/43317752901.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/nelijanotofudunirisibefuw.pdfIn PDF document text
    • https://dukupahit.com/contents/files/fememuxet.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/zedupoduz.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161405b2581719---lasaguretapudapikigemimo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/kiroredowef.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/98793510991.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/rivulewaliwilomavodetozi.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_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 18196 bytes
SHA-256: 944f220b30738033f9bd4fd3d3d27fa42a02380bc9d658f70dedc1388866e64d
font_02_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 10812 bytes
SHA-256: 45cc09aabf5ec5d79388f478d4c18633ab0a9419354df502b4f98633e51b3074

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