Malicious PDF — malware analysis report

Static analysis result for SHA-256 89451c45cc28662a…

MALICIOUS

PDF

129.2 KB Created: 2021-06-08 19:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: da08c372a3973bcccf6b0d14ac852570 SHA-1: e465d083b4a598500a2546f165287d18a6c8cd65 SHA-256: 89451c45cc28662a5e6f37da87ab9b9896460bfe2e6ff31f201f8c5ff32c3163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://garglob.ru/uplcv?utm_term=financial+%2526+managerial+accounting+free+pdf PDF link annotation
    • http://best-infosystems.com/userfiles/file/99004872138.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/57190771646.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/450dc4963079258ae19e47dbf39bc065/57056565085.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf052649d70---xomebewudeg.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e3c9af9b6818eda72e067bdb3761c557/bokofiwuxugilununof.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ffe2275c1---kogidigu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1g1jqcld5o7b4njdbbnkl5qdko/46535317080.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc9a1f1871---71697312236.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16086146325e25---49634526543.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6fa15cf3---61440745848.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jv70o504q4jum7b7q3jpncgo90/zodubavobijosowe.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/lenafepobizasesusez.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c60f3e5d---sofekun.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/biganofaru.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b7ccf09477bf28802ef17b6c456d9f28/bevisufen.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bilatemonazozerepem.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/81b84109eeafd81f26768130839d38c0/nopevizizefadunij.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014495.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14495 10492 bytes
SHA-256: 7aecb913246737ae1adaf8f62624104937edf95536de04c0854f6b1504f3306d
stream_007_off0001a79b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A79B 24304 bytes
SHA-256: 713960992c6e4d8587d34976bd66bdc1bf2afdcf3861340597e4d685688ac478
font_00_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 14840 bytes
SHA-256: 89d92b3c65f672ac826b24a152785ef0978f687d9e28f1dbbf13bab67d707efa
font_01_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 3948 bytes
SHA-256: 908c8b514bd3d2a3a40b732cfb71ee62ee2ed9bb49dd5789d0ff96f28257a815
font_03_sfnt_off00016289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16289 25988 bytes
SHA-256: f2a6d7a85f9225aa2afae6526787154a45056f38245637da6435bd46077bfbf2
font_05_sfnt_off0001d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D20A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
font_06_sfnt_off0001e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E009 5584 bytes
SHA-256: b83339cef74633ab9528084ff9091baad93f6171207297d4d03a14f34e33cb47

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