Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dc0ee78dbd05f2…

MALICIOUS

PDF

79.1 KB Created: 2021-07-05 03:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b6d2b5f6e457c1d28eede5d1b87e913b SHA-1: 0265cf062356a84a20964d0ac4f366ddcd716297 SHA-256: 50dc0ee78dbd05f25ccaf2ea910a56acbd7b84e6efb78cbb95d37bc5db70267c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://soflocops.org/clients/83264/File/lijavozunajukidulemi.pdf In PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b0cd04e17ef15b1a860cd7599d89c1f2/39291485328.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3fa9013b7---52608845034.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f72fbaef7f---sanasibewep.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e92d0b393ddcf72dfe3250418d4da29a/livunir.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/mivitozaviwivimozupolo.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/55954547365.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754e961f8ce---97415005620.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160810abcd5f07---lunixebepudel.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/63724796603.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69a697f52---xunimar.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/4478231118.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dcea532cc---pipiziro.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/10003061932.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a13ee336e92---wilesezozad.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c141b49ad---29617053923.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/5960253536.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/66846964326.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/24807869360.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/kizovemewonumadojarixu.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/64371117361.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/b97ikkuesdche2ak15ot1at1uj/moxaremowafapilejesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=garland+county+detention+center+rosterPDF 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_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 16068 bytes
SHA-256: 8e55a2e2394fee7fff44ff9880fb0edbd5be36b79c71c95a6a60a968b7854c36
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 10616 bytes
SHA-256: df8429225e292577b9d77ba2988ec3fbba31195d31476bd86b015d80f6277832
font_02_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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