Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8b8095c1a9904c…

MALICIOUS

PDF

92.3 KB Created: 2021-07-03 22:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 136f88881da2923ecf7bddef61b03885 SHA-1: f66aee85ebc8bd8e9d714e320c9aa92ab1eeb2ce SHA-256: cd8b8095c1a9904ce2c84a9adc2a40f06d5f31100612fbaf334f1414d752904f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest this PDF is designed to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1j5u8rh8hb3qgo8ne6trkfhn7i/3265397306.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087d087e6700---polakoxoxesuxexeboja.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/safokafam.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/novun66npifgpajb3lb9d2bslh/xadagewexakovefuvapi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c9897308ac7dfa85c0519c8309ee2c20/55993831976.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde30c5682---feseretatut.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/mewederolajorupuramole.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/62834552065.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/dda88a643361bf8611c1e9c3ba7303e4/74027167270.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ea0c06c7b4a96d4c2564b25232690a29/titajamibegezumezape.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1d28755d1751a0d97cb92fd6a8c91a48/5904888746.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/29075956238.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/198e929d4196c90895a5bcd31cf171e2/88243656838.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/nosivikerulugapirezagade.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21e00f6613e77c7c807fcfa2a3780c3e/23269425443.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c92dbffa0e31efbceb5c66ff700e7ea7/90861799369.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b06ebc20---wepexisa.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a19f9038df59b38f01206ebb2592410b/95031438737.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/lupuwemevaxadavop.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xelijefegaxibovumawixus.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/912ffded9c9ea8b29680982de73d59ef/25198660146.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/5tv6vbg11qrsm7sqe89q6f7f1r/34736054711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fifa+18+apk+download+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10508 bytes
SHA-256: 9bfc05ea02cd85db9ae9ef4e1ee57b9b754deaf085360851db2b4138b0a74bde
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 16516 bytes
SHA-256: d72254e399903a88e6ec4d8a104b01da3d6eb9d740d75f840df53238f475d4fc
font_03_sfnt_off000148d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D3 17652 bytes
SHA-256: 51714ff06e1f28a507f088498e5f1ff75863a3f440dffba4e7475e78a52fad9c

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