Malicious PDF — malware analysis report

Static analysis result for SHA-256 372c515bec9ba8b9…

MALICIOUS

PDF

74.0 KB Created: 2021-09-15 15:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eee479542eef697bf2e518c4fcb070ea SHA-1: e059bfdbf093345cdb7c0bc11d3c20ff07125600 SHA-256: 372c515bec9ba8b96be13fd3e659efff4593252d657126ea14f29b18a2d51334
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards the document acting as a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=tamilrockers+harry+potter+movie+download PDF link annotation
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613238277bc38---dolodepiladesezi.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/wivabu.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109081510137817.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/91263749238.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/lefopijotamizetosidisesus.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/womefavoraloremezenobelos.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/devotuwatakuvobejebaru.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/miluna.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/33804793258.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/fepukoviluxekudaxetexoke.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130088adf720---29790040737.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/6f0b8bf04320dec25b01ec492cae5b1b/54993412296.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/37020871643.pdfIn PDF document text
    • http://akademibt.com/resimler/files/49746090423.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/mojeluvabikexag.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/gawesinap.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/29328873904.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/vimusurunupisuf.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/zuxilifirefeliwoboke.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/26921617204.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/62009019669.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/49658417709.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/muwowadotirawoz.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/30968138043.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/50425707356.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_off0000bdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF8 16652 bytes
SHA-256: 8289f91bed36acbccea6a1bdf7c42825a30b111bc0f984427b218ca5a4d651e2
font_01_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 11100 bytes
SHA-256: 56b1fd9c1c5a98f663602d2adf17ddeb3d45b5ef16db1062f21105488e6f5311
font_02_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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