Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a61ad5fe08678b…

MALICIOUS

PDF

403.8 KB Created: 2021-06-11 07:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 86ead9ca5771d88bb9d4a3fccf15795b SHA-1: eeb7b21c8f79a9492710b380087145d260a003ed SHA-256: f3a61ad5fe08678b6dcb98087c01a4350a34119c45f7e4113ff2054ce2b49811
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it is a phishing attempt, likely distributing malware. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple compromised CMS upload links further supports the malicious nature of the document, which is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8548

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://medvor.ru/uplcv?utm_term=premam+naga+chaitanya+full+movie PDF link annotation
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9456a5a45---83753321927.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/316a3d0e76336b8e1218b969efc0c183/voxobapajuvasela.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608735e500e8c---zefigejixojumesuwizim.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210530221937.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f9bfe2c32---70634036503.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bro9rl33s0duvtigd36ikr26k3/89339735351.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/magenimibitivir.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1623376105.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/47767547273.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2d04b15496c1d68bb31709853e49f9a7/kifaxoruwafebevagezog.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6c5807ad1ac24964d286282dd88195ed/tipujivo.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/fewudedubokunuvemov.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/kaxugesami.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d180ece48---73199405905.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b87c1b6051e---modafikidotogufawub.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://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_007_off00059baa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x59BAA 11628 bytes
SHA-256: cdcb03c7c336e4b0db1ffc47a4bc5ab9a5fce977bf4dd2956d7333fe71078f99
stream_009_off000604be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x604BE 23852 bytes
SHA-256: 0739bb5764d765da33acca09ab035d6d58b031cd68d69d01a858e15a66bf7083
font_00_sfnt_off000542d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x542D1 18644 bytes
SHA-256: fd1b2b0d348d78deadd8308b2659ac7b6bb0fb499badf7a8c7bf62274fb2f697
font_01_sfnt_off00057f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57F72 5280 bytes
SHA-256: 5ce7175f8912042995494570432c1172220e71dac7eb79a5459c4221bbd45821
font_02_sfnt_off00059152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59152 2352 bytes
SHA-256: 04022f7e0924be75d462ea01f50628e59888ef895273b36459d759e53d346c62
font_04_sfnt_off0005bc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC7F 26320 bytes
SHA-256: 352e688b5f6b0682b4ccfe9c5e4c28e8f609ec4cd01cc4803468c5397b0e4479
font_06_sfnt_off00062f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F45 4228 bytes
SHA-256: b5d8afe97371deb1a134b91433a2f6fa7f36707c602213566d601c50b00e53ca

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