Malicious PDF — malware analysis report

Static analysis result for SHA-256 448b5cd63dc3ee53…

MALICIOUS

PDF

101.2 KB Created: 2021-06-27 19:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef311d0a1ae0f0d79870348356e04d16 SHA-1: e56d7c8b86b07a6fb64530efea6bb1ce3a9cfec1 SHA-256: 448b5cd63dc3ee53c5533a44b5ab224da5f859555cbff9a27249620a7d8a776d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised WordPress sites. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79b0b5a198---48947728305.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f47a04405---13351948893.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9a380049ab1dca0a11649390ca9cf37b/3959133633.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5ac77a3b5---15787961624.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7e0e1367539c3d54a3196ea5d48cb50a/jeloboxinapepudobup.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160710bc9657be---76422697171.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0564b8e33---wivitukinubilowukulup.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984987e1a6d---vipirenilusojiw.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0855c5822---42979017438.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/libozenavapixemo.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c225563eb1f---fajewarirotujupokeg.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acec3856cc1---32990036814.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa833352e89---xulipoporijuzemedi.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/77323817967.pdf
    • http://okmarin.ru/userfiles/file/76963401089.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d47789991---zafopomiviwemofivokopuze.pdf
    • http://zartmobilia.com/userfiles/file/20210602031655.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720ef175c91---nekenumuku.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/49467880192.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9634a7c0d77b71765ccd68def40336a3/23358210803.pdf
    • http://accessiblevehicleservices.com/userfiles/file/pidilodotole.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/p2seu055d5loc3g9ir865bnk95/zunewupakawiguvagav.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3da12b8c255b0c3279563556c3ca2cf6/19785163193.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4b0dacdad70478495df12c0487f6a7cd/25700714502.pdf
    • https://edcasys.com/ci/userfiles/files/4473752404.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160840981bd43d---birolimudibezotilebuda.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=about+me+questions+for+blog
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001112c.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 16312 bytes
font_01_sfnt_off00012733.bin
bdc5df89d63b42bbefabcc76940d48d18a07917b4ee1a595f7994080521015fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12733 17364 bytes
font_02_sfnt_off0001548a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1548A 16792 bytes
font_03_sfnt_off00016ca1.bin
5e1e0651a998e8fed607d47ee812f3a0c114aa475b1a77b46fcd035cb62ccd80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA1 10760 bytes

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