Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a9376764992938…

MALICIOUS

PDF

171.6 KB Created: 2021-06-15 19:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 18abd7f127ababa5bf64ec7f06ed1b3b SHA-1: 44619d2803cfefa7e1dc13e96dda8d28875e8237 SHA-256: 62a9376764992938ba0b76ae5ab7b59d862f898def0ec5d0020218809a628a07
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 0.9711

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://krisoc.ru/uplcv?utm_term=chidananda+roopah+shivoham+lyrics+in+sanskrit PDF link annotation
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b1962ec89e4f55a975a08eab4f72fdae/rivegitupoxofemeb.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/48929923561.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7656179418---duverezufomanekinobo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/74bdc3a0a2e68e392ccdee2afbe99ec8/xazive.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/39328580284.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d90cfdf8---zuxozalimipobawowi.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/31715458700.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/adbd56ff6f5e8b8b0e8d8eebe69f5663/85846256181.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e23c230ba88543f14e58737ee8519cdf/notesarenin.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091674ae53fe---86767817814.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/79148235130.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2fad9d051---zuwefixugasezez.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3057ec82c---3385192781.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/57e680298c1e24a98c8dc5b64eb9de16/38503744051.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/72e6c89af19eafe62b24f71a98c2a4e5/69508898308.pdfIn PDF document text
    • http://adveotec.com/img/file/zudibanumisixulugog.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://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001ba75.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BA75 36948 bytes
SHA-256: c84cf0323605db994a09c6150306fbda21ab08d632871527e6721c54bb5ce9ed
font_00_sfnt_off00014185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14185 5444 bytes
SHA-256: 8d7fa96e0bcc09ef95454112a86436b3871e08ba46158071c5b31d83ce6376ef
font_01_sfnt_off000153e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E1 17436 bytes
SHA-256: 5c0104b8ca2b28fcd0e655f0d84b4b20e434344de3713373a17d898f66b566d3
font_02_sfnt_off000179a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A9 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_03_sfnt_off00018503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18503 16968 bytes
SHA-256: 86e88a6115dd99e9f0e32601be5f5ffd559ba2dc369bac694bef2c5cd7025ea0
font_05_sfnt_off0001fa63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA63 42500 bytes
SHA-256: 46ca9f78244f6efa9579f9e42fda35bd776163ad3b37716b606f2e41b71ebe1c
font_06_sfnt_off000249c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249C6 12720 bytes
SHA-256: 70c0d3f284827eb77e1bcc95a3d87baccd16926c358bbfcc51a7a96d88781f5a
font_07_sfnt_off00027029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27029 13904 bytes
SHA-256: 1ec02344ede645e1037e4e71484fc75b72675de2b1c90555cf27a18e06782b91

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