Malicious PDF — malware analysis report

Static analysis result for SHA-256 432250280e679271…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 21:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f7658fa4a51a17f697c7e9dd5b9354a SHA-1: 748725dc16cc0e00e79e6f04df9c818f1837e104 SHA-256: 432250280e67927189c9d9a3f8242d2c9a7a49e8fb73098db6449f4bbba8ba4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3ovtpto6uhft0ksd2cutlk82m5/67812385461.pdf In PDF document text
    • http://alacarte-design.de/userfiles/file/vegovi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/35070660306.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/mopopogawodojuju.pdfIn PDF document text
    • http://allasclub.com/campannas/file/57226954860.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/jixubodewejoj.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e718aab5b2b---zufekajedakuvitekize.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/486fc1433f0a6fa6adffa7884737a1d2/9950697415.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/lamufoz.pdfIn PDF document text
    • https://estoniapools.com/contents//files/vuniredipidufonolapat.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945698be0c1---97663944900.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/gazavin.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/dozixogezosi.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/zumetezazusuz.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8c91sfa233eilvju0essru45kv/dimifilemibena.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nkgbd9jnl7hpj3qukj70gq7cj2/dogume.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/79324196600.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbb530ba7d---saxizejoketejivipuka.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/655280727.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87e84e450d---98391960507.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280ecd3091---migetetomuxide.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/26637466874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=directional+control+valve+rexroth+pdfPDF 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_off0000b683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB683 16440 bytes
SHA-256: 1ff4c7115f9d6590b3382cf54d141d545f191ac90ab230b4d7be6202807cb86a
font_01_sfnt_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 10720 bytes
SHA-256: 7ce72865ea39ec330d24c580bfdff9fd6e620ec03828102cb20f69d1deb147f6

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