Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e5494e67ee0c0f…

MALICIOUS

PDF

141.2 KB Created: 2021-07-23 04:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68086552cce54cb02365b65f7c8138c1 SHA-1: 35cc1c82c86c0752f06f90bd75fa86b1b541ae4f SHA-256: 50e5494e67ee0c0ffb95151ee6f26dc0c5981cb777a7da37c822275e833311b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ivepe-elearning.gr/assets/UserFiles/mainHome/file/59880048300.pdf In PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c309e4429f---walagesatutuka.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d0e7eb08856706280b87334f4865435a/raseza.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2bdce89b7fc8992ef5062877e51d4de3/31071098630.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6dfb74937587f963b579ff8824eb834e/livorozu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f38cb366b---ravafojomajojatotuxokako.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607879215d889---74696954892.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079220b8b4b2---jejilerajagujuwokowi.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fc27a673f37790e55b291fd5d5e30aba/zajonapaxaxiwovupojopozo.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/fukajukakitera.pdfIn PDF document text
    • https://latework.cz/soubory/vadatasunajoleteg.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f49273b855220e2a301afdec5c3cc313/14204776511.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/029715514c84f1bd2a2d115468eaaaba/fizunanogifisowakotapo.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/93865996453.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/veqnccettcbptgsjuaasb73205/sipasebifo.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/rujajekarobozusajixomuku.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/17030554407.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa8def3e9a---18588541375.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/71a1973f06b8f3c62547f98f0c441351/kerowomano.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/basinizawanurofij.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/zakevozirip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=about+georg+cantorPDF 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_off0001a75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A75B 16208 bytes
SHA-256: 703724f25b6a74ab05caf06b3062c9a587ee53cf61369e459f88541cf89c8cee
font_01_sfnt_off0001bd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD02 10320 bytes
SHA-256: 16e8cdf75df17ea38549cec8de002328b4893ed2cdfa1bc1106b1036adddd43c
font_02_sfnt_off0001d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D477 23220 bytes
SHA-256: 38352df58cf35f80344d21ac1eff77b56a116a80c9585d2a5c8b3d6b0617e921
font_03_sfnt_off00020ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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