Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc898c34d928c13…

MALICIOUS

PDF

92.1 KB Created: 2021-06-12 13:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c5f36f255117e33cb6caaf8ad6e84067 SHA-1: 6a2a93921a98b6b28333f2491b34c74bd04db1d1 SHA-256: ebc898c34d928c136e2a03cb79f5b88b9597f8b277da450e4b3403ac4650f555
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 0.9996

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://catamma.ru/uplcv?utm_term=coc+quake+spell PDF link annotation
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/taho1qdt2v4asmprqjlrml24h4/97247952066.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0ccd908e---93143018581.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/kaxumutimefatew.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8b2167d9e5bbd6b4495183b8535450a2/vagutarufi.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/07f0dd1cc128e70dbe1bf444a22dc77c/jitiramiwoxim.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/73850916926.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/802b03c4e44845997bcd13159a7055f2/23545573645.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/29b14bd5bcece7deaa94b2b3fb6e1456/51204498245.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075738fe7474---jadofijuwololig.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/450a139e9b05da89e8e02d05d7b51dd1/goxepeburavul.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/98001423442.pdfIn PDF document text
    • https://mszukam.pl/dat//file/6969151034.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c125c624014---xawabojifaxunazenet.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/9965191693.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/61230460293.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3l714d55v2ibv62notsp2shbk1/wopagefuvigizusotes.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/80575420502.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafdb1894ae---75038669140.pdfIn 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://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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 4928 bytes
SHA-256: c481c5222eb0c4f8aee944ca73008f4d1e190c1c4c144f855db4e8424748d8eb
font_02_sfnt_off00012743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 11392 bytes
SHA-256: abd180cbc9757b2d0ca8c9b3cbdd52db360f7e47f1dae14d933e8d6d0420244b
font_03_sfnt_off00014e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4F 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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