Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bfdc5b45ff55a7…

MALICIOUS

PDF

109.3 KB Created: 2021-06-09 05:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c504c49547c221c3d75c42db1c4c042d SHA-1: 77938c51782c208da43b714f1ee25d630eb51a9f SHA-256: 43bfdc5b45ff55a7a36197e92fe4a3bd493e0acae0c3b973823634c92292ebca
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 0.9985

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 https://drafthe.ru/uplcv?utm_term=tamil+flac+songs+telegram PDF link annotation
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7dbd812e---toruxab.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/nuwoxubomoruseduferiveni.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/43f35tt6s46s2f6fimvf49ep37/36357477625.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875924ec2ff---14419793528.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/856fac59b2fba64fe0b6d85c0d99558c/putuwupexavejogogiwoke.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a92cfec944---37408304397.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/133a4a86047f18e93896032fd8761e90/23644327479.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jitazevorunibemukoraxe.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/fd6a6cftilvcltrvl94vpv06nb/33088832352.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3eb475743f5de67cee21b95a1b246a6e/winilikomezadap.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/37779d7add4ac4886fe1bbabba0a4f16/95766454335.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901436ac6aa---jeviwikijejej.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b501a77f729---fobolosa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0667803d3---rosixaniserebezoled.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/kvklnrr13dcp2ql57qdf3c5o3v/18019543012.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011bea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11BEA 21652 bytes
SHA-256: 3c94903263882ef1ed447960d64a13ada5857dd11f2c8a6c053220aea1237d0a
font_00_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 3436 bytes
SHA-256: 63a404f9960c1f58aeb9e17ce15de30db2d699f2b74248ed7470eddd38dad3e5
font_02_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 5152 bytes
SHA-256: 628492e6e650c75718c0a32696c1de26602310e6e706934a5169d8f729a9c2f7
font_04_sfnt_off0001491d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491D 9840 bytes
SHA-256: 717d94309abf67b9f53dc6f20c370cc03fc4b7680e916a8a3e29794bc7c3f86b
font_05_sfnt_off00016501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16501 11660 bytes
SHA-256: b95fa9d210789423f6ae92bf509beb626386194f171f26a176a2c5a86e45d04c
font_06_sfnt_off00018c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C7D 17112 bytes
SHA-256: 9518bcbe8fbf4261cd83f04e6479f3b15db5a6cd2a677b98e9ace21a68078691

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