Malicious PDF — malware analysis report

Static analysis result for SHA-256 779f3d68be3f642d…

MALICIOUS

PDF

76.2 KB Created: 2021-08-03 16:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fbe860b7bd8da18a29ddc5d1c91187f7 SHA-1: da05e8e599ce5bc682c16a9a5f34a0230d3b7cc5 SHA-256: 779f3d68be3f642dfd306547d0d7ebb262b7d4845bd80cd5e053e1cddcd1c754
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The numerous URLs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to lead victims to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware delivery vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=brother+cs6000i+sewing+machine+repair+manual PDF link annotation
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16084c5f3f010f---5275454846.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/51467609813.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc68fb73c0---dopasivopogipetenoregux.pdfIn PDF document text
    • http://mcalesterhighschool1960sreunion.com/clients/e/e6/e641a1dc2b4fc8b0483efb779338bfbd/File/13044046614.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4bd09646---ribijototonapowidopowem.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/rufunisatijijubefidobubun.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cffe9578e2---20123666949.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4701984a5ceadc088df2f04bd6e65990/18777680920.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/misexor.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/43698258430.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/22769234324.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/sibepemukijiboto.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/kedotezupigumifuwatiz.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610449bddf8c0---31064064871.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/dikugubifapapix.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/pixudipazanojor.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/fojetotukutakojenoriwuxeg.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/960820d162dab7406a86ab6f266b42da/vifesexareminakimifiwupub.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/xiwaje.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd962dd7f---3163419364.pdfIn PDF document text
    • 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_off0000c6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A0 11348 bytes
SHA-256: b1f284d0f234d42e7a0b176ca73758e1118ea114ccb678617a7a66cd9d13d371
font_01_sfnt_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 15516 bytes
SHA-256: 398edbfea2812ff14453a5a4e258b03574ea4552c716428148a9864a798cbbc8

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