Malicious PDF — malware analysis report

Static analysis result for SHA-256 617210637a72fa42…

MALICIOUS

PDF

83.5 KB Created: 2021-06-30 14:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec542d07b973b8ed4612d89298b33a22 SHA-1: 4a64cd0f5ab1abf3296deff0a963d528b7e4a184 SHA-256: 617210637a72fa42f645a59392f5fd4922bfcfdb2b7ebe99270b4b35760c2ada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7df982f3f---xuvakula.pdf In PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/67250396150.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6cad810d8---xolovekudamikujulepa.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/pu8ihfakiosjje029kga71q4bt/pavekawo.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef73ecd647---116592249.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfrrvrvvhfn3oangv02ndb4l67/xazunanovojikatojipefe.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/67447815194.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16215127647201.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607217a05d833---73060492298.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/wejovemalafinu.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/xakefu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/l0qf6ihgb15v61kvo8peo8ekcl/nupepupetodetozu.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3e8c4cff---ranuziw.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c701cf97c---28853048588.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/fosoropifupod.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5nnpdhatr2lc072ieg644k8g6d/61942595670.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85f0222da---60375139860.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/3uhmudqvv4h8vmhgi2j477jo0u/kunebi.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rp0ammh5d1a0svrj55vv7rt8s1/21641017717.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f88064f514ffd2375a51b18c3bf45632/gokixa.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b25f1bc5bd8---78019487256.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/31423663439.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8575d226e---lorotufaxewerapola.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/1613535182.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/timajuxedorekobomaride.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lucky+time+slots+cheatsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 17816 bytes
SHA-256: f0fe114c38909fee3b8f52c13f5f3e0e78cc3b0c8d95793fb1b45f40502dd4cc
font_02_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 16392 bytes
SHA-256: 40b7af75b106e3f19dbfcc15b11b64e2ec3f60bd9078273f4411ad0c85cf8811
font_03_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 10556 bytes
SHA-256: 8b919be9d3e5d3dbe34ebc20234c684334817b7a7e63da71d55fc0d5ae1f348e

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