Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc2bcfa07e35619…

MALICIOUS

PDF

209.0 KB Created: 2021-06-12 02:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1f12c3e5e61ec475df798e2ec4f79c82 SHA-1: d18d5b7fc5439a6aa592e07686048835a7668b35 SHA-256: efc2bcfa07e356198c2e92fc243ee984ec9532d21582b24ee73343596aeab3a0
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm used to distribute malware or conduct phishing. The embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=mission+impossible+rogue+nation+subtitles+english PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3d6b7e98---16984478964.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ae29d0257---xonejujibefoturolox.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/c1luou8rifdb4mtdofh5bihkc5/38781040407.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f1c1bde9---80667745537.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1qhan8750alfrp4b5nfhl5rbt5/xulol.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb0cca8957---20210668711.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/sarokasimitibosenef.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ig1cusm3oqug9826p50bacen6m/58718672980.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160779f6d7b90e---37262011187.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/11814036512.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/2p7ll1i5fq23viiddm520t1n91/pakifevejanulesosuwi.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/762d6ebc298d03c55f92cb1f7fd92ed8/poraluxabixinu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e4f3702e14e2cc87516e48afbce16428/57391808134.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kipefutadedu.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/bezosudaza.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/67910428404.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00028c3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x28C3A 6376 bytes
SHA-256: 677dd53435b014528e824af9ea1fd6fe9c066fdd78e0f2a10d680d99864445dd
stream_008_off00030691.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30691 26796 bytes
SHA-256: 1877b8e2b1f6639b76d9265f00f4c39d42e1cbf390ae1a4bbf17e554dc24f247
font_00_sfnt_off00019d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D84 64124 bytes
SHA-256: 32c3c7cabe21b8d7f00401faeb2d9e463976fffd6bf7102f2972186f9199b801
font_01_sfnt_off0002608a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2608A 5376 bytes
SHA-256: f6bb4ffd9b785546517b321ded72eebeab2a80df0c7738e9d636a3a555a9505d
font_02_sfnt_off000272a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x272A6 8140 bytes
SHA-256: 49806368e96c7bf51292fb4480c80a2776bf18745451724057927b02d66fc0ba
font_04_sfnt_off0002a215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A215 19148 bytes
SHA-256: f291c8dadb9ede5330116d736c7c0348345283949f344b5788c829ff4995aa60
font_05_sfnt_off0002d01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D01F 17740 bytes
SHA-256: ceb8b52709fb6bfa55558dc618d8bd64afebf7b648deec203f461665cb75ef1c

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