Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8e579d08673eee…

MALICIOUS

PDF

68.7 KB Created: 2021-09-11 17:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcfd2e3b6baab4dd4278c5891950629d SHA-1: 04d92ff34f6909aa3bc84988f74f4342a6181aed SHA-256: cf8e579d08673eee366a1e829bb8da5af8513e05f245f030f5a7fc7d8f85385d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=how+to+download+movies+on+android+device PDF link annotation
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/98604338510.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/86072788603.pdfIn PDF document text
    • http://linza-market.ru/upload/files/kawawazetonojof.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/tusaxarizivijasosawejug.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366be0ab9cb---77696553706.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210911021839.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/21912037416.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/777379891.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/zuriro.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/sametilanaked.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/45037907584.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/navovajebu.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/7194553847.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/turozotofeziwuxuk.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/31933519656.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/dotudezomujuwukid.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdadc9195a---69385566057.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/14298481734.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/vinivipu.pdfIn PDF document text
    • https://tessuno.com/upload/files/612ed6c00407e.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/vupagirimosenodu.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/44399038264.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/14048999629.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/zixubekamexogowavosivev.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16135f0f0b3e5e---24608461826.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_off0000b0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B0 10672 bytes
SHA-256: 76d2fec311ea6ba0227fbeca480394fa7aeec760f8ddcd6f7e5fcb7f53491ee8
font_01_sfnt_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 14424 bytes
SHA-256: b4ef499179c51e6e92cf8d4b02ffe8165825569772bc3fd98fb1b034aa814f2b

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