Malicious PDF — malware analysis report

Static analysis result for SHA-256 16592dbcc3f9568b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 21:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c18fc6f6fa24af9b67b58765919f9efb SHA-1: 5be7554599745b13f443303f66c009dc0e6c7eab SHA-256: 16592dbcc3f9568bd3417263aa10982c79648482a702b6d62c516ab598f3c685
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a URL with 'phone cleaner download app' in its query parameters suggests a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://cristal-in.fr/userfiles/file/dexekuv.pdf In PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/bavazefajokipopevuzow.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/rebugobukawabokase.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/73972673736.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/18781556903.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/60840628337.pdfIn PDF document text
    • https://botroul.be/uploads/ximatavutopo.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210911_F9B86EF3A3803214.pdfIn PDF document text
    • https://servicepapik.ro/files/61310464922.pdfIn PDF document text
    • https://conrays.ru/f/data/87810512666.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/12242209616.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/53020235571.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148a54b202bd---vupudasegopoxe.pdfIn PDF document text
    • https://vzglavniki.net/data/file/85882769474.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/81883fed7df7802bff2c0e8f9be1eef1/8723783679.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/31605841982.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/vhjr47hflftkd5asqmg9rlek50/6423838626.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/mesigivobu.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/81647714161.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/pajuzuxugemag.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/65433408251.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/25315962812.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/pavetumipemopolaxunegit.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/70506959260.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/nufaveno.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/lakona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=phone+cleaner+download+appPDF 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_off0000b2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A7 16840 bytes
SHA-256: e8796c0f162bca85ab3ce3c3aafab0dd0fd27bfd950ba6155cb107be56e885fd
font_01_sfnt_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 10340 bytes
SHA-256: a5f458ac284ebcc58908d459ee0e8dc05e59945aed2bdaf4ebbf5b395f0e7fc3

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