Malicious PDF — malware analysis report

Static analysis result for SHA-256 69af02ae9d384657…

MALICIOUS

PDF

76.0 KB Created: 2021-09-14 00:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc6de1730288bd8b5f47c2d9bf93b6e4 SHA-1: 08b88436a138f521799d32a21707853672d76c5e SHA-256: 69af02ae9d3846573a373f61a6dd0d0044c417541d1df2d763bfa950039d3dc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs, many with UTM parameters suggesting tracking, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=usb+tethering+greyed+out+samsung PDF link annotation
    • https://gentrilieu.vn/userfiles/file/9515040405.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/40744420694.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/togufojovego.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/mukopemusigib.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/miwekajevire.pdfIn PDF document text
    • http://citranco.com/users/files/migababipetazebiveme.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/54487733749.pdfIn PDF document text
    • https://digireg.it/upload/bepineguvutuvapa.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/68883027903.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/25119874911.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41c90245d---54438401677.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0543e81c3e63471ccb388bc4bad91e5d/sewuxotekim.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/metawifesiwepisimirivujux.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7d1b3c54---luvekomozitidetazatat.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210913082440.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/neges.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/datagesadiriroxifolizok.pdfIn PDF document text
    • http://zzquansu.cn/d/files/logelivunomuluxawewom.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/86184890912.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/lemupan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb43b8a774---79421619049.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/58311031613.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/zasejesibuvusaw.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44C 11012 bytes
SHA-256: aa95d10bfee0aac46e921def8c7d3f273881461194360c0b2d68db63e615ec61
font_01_sfnt_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 17320 bytes
SHA-256: f7da241778fdc8ee6bcc1352db8815efaea3ebe9bd4561772317f2b30c2e6227
font_02_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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