Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23c7bd572ed64f8…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 04:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8f70e68cd5b4d29053d0b80b90de3b8 SHA-1: 7d383be1e5e2a9b2c49b698b5fb5f0fccbb7f5c4 SHA-256: c23c7bd572ed64f804bff6cd8f9b7ae7cbfd4feef0f73eddebb089bf5e4008d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure suggests it's designed to lure users into clicking links on potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ed4e95cfa2058b519f01bf88b490f7b9/lapape.pdf In PDF document text
    • http://someteme.com/archivos/_20210627010030.pdfIn PDF document text
    • http://lulanjina.net/upload/files/tazijitojoda.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/t00sdu9irhm2r7uqa5akhtjv0q/26969311902.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/56339832290.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0f688f21e---43387511843.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfaac1335---tugopijo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c55fc8814a---kowiboruv.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/62ej7gdapfqifadmss0s1cac9e/11670796275.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/o8peho6j7all08pto0slgqe5h1/butoguzulexesezixurat.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/oqfkujk8u4tbss3blg81n88ee4/puvokesoterifijalo.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/e36cbpeg9kusk0fbu6r7noqohb/71456697569.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/45307198895.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5d869ca530be2f204e06587820d47938/68732020186.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/90201557937.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266f822f07---pujojafojisefumuwiduk.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1396931f5532192368f917f7b1f89d80/vaperuwegokagiwutapa.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/26706517952.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609272689bbc7---7498315765.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ejh6l3pq3hn6l3kn3f5t0upike/87009806075.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db1c128e28b24cb0b1d4c36528ebf88c/62266066565.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/14638843731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=find+the+greatest+number+of+4+digitsPDF link annotation
    • 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_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 18812 bytes
SHA-256: a1814e92de655bb2b86cccd3d1e7ba5c5f05db4c4781d84f262c084e015d7842
font_01_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F4 11048 bytes
SHA-256: 099b052a4f5d5e872f40a20fc07b915214fffdb9c357f2adbe7fe8d631eb45c1

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