Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed585425f27700d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 12:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 38897111d72bdf694933871f2b31e1ea SHA-1: 2f76ec4520e5f22e9e565b17ed036a6a8170e2de SHA-256: 1ed585425f27700d1b029387a5b714f8eed4c1d845886f36ee8eb385a7edec37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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=free+download+pes+2021+apk PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161454743ac819---dujoredumag.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e1ffec93f85961e26b330b105a900955/32308668335.pdfIn PDF document text
    • https://12shio2.com/contents/files/64225987595.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/jodizuzifapovulilas.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109201343324195.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/xasikekajijojevumo.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/wasesivobigun.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161302dc786421---dolif.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/45612632361.pdfIn PDF document text
    • https://vleek.com/uploads/files/biwisumod.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/78270639855.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jekerotixujajut.pdfIn PDF document text
    • http://mayjack.com/upload/files/nidogavivuf.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4c69975123f817a32d63fa5ed9555628/lates.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/tunigetepevodaganexage.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202196938308388.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/tinawudep.pdfIn PDF document text
    • http://saint-party.com/media/file/87916695785.pdfIn PDF document text
    • http://eksternest.be/images/file/gekirafekijofel.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/77970469211.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/jixowiravawip.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e38de7ca36---zajiruzawunewavusolu.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/57397777048.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/70778102469.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_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 18120 bytes
SHA-256: f3a4e1fcf81cbc432174f37ee0bf6590b967bdfee8e2748252f20b0687a70669
font_02_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 10644 bytes
SHA-256: 37098c50e95f96572757be9f15bb564dee689571eaa7e3cea8ba0a17c6e11a6a

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