Malicious PDF — malware analysis report

Static analysis result for SHA-256 a550a7e0d3f3d177…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 06:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4f2e83e3f7549d4d2c6961b5714a0f3 SHA-1: ddaffc984ec4ac4a71122eea7b0f7187f5176d06 SHA-256: a550a7e0d3f3d177afe556d46af03342ebf6105bad20dda555126f800cd90e90
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The presence of numerous links to potentially compromised websites and a deceptive download button suggests an attempt to trick the user into downloading a secondary payload. While no scripts were explicitly extracted, the PDF structure and linked URLs strongly imply an exploit or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coopinproject.eu/ckfinder/userfiles/files/99436898648.pdf In PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/47174772372.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/30859645718.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86f4dcab2---59957756673.pdfIn PDF document text
    • http://sushibelovo.ru/files/duwunupaboxozaxokur.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/waloxupidam.pdfPDF link annotation
    • http://syuncyoku.jp/upload/file/2022616989.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/30528354706.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/lanapotepoxoxilifaf.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/70606977581.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a0ea68c6---sodimosekuzikeruwaleta.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/32014611415.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8713eec28---32881310825.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e115d21452---fibedavufavegonojumuke.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/pikapowewomaguvodonob.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64b98d502---kelakijamunezepelemug.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2bee349f---tutalogexelagab.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcd46c50f8---suxuxikunixokipu.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/42566138353.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/bakivuwetev.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161075fd2b013d---wenezoludilaj.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c4d595e4f487c2974f34ab6c9d293665/ziwaled.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/39862206074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=increase+pdf+size+from+kb+to+mbPDF 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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 10976 bytes
SHA-256: 7b0ae663d413f3c899b7238a375ea77b479df2ddbb33cd193c8f0a285609a06b
font_01_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 17780 bytes
SHA-256: da11613de6467ada859597cff22de394ba79ec5f675b09b9a932ecc115a58901

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