Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08936ffdbcef881…

MALICIOUS

PDF

75.8 KB Created: 2021-09-23 02:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e56df27cd8bd372a752ad5e2713191d9 SHA-1: 2eec28ad6283bf4ffcee910514a46db5d19164d9 SHA-256: d08936ffdbcef881cc684851fa85c08c16edcaeae0bcdcb524f3e166acf54033
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=all+by+myself+piano+pdf PDF link annotation
    • http://avsa.org/sites/default/files/images/files/wuzuxugarawilek.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pg5h37h4t6rald2u8rntev2966/3819848683.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/zulufobibopamikegelaju.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/71688211974.pdfIn PDF document text
    • https://lecachet.fr/docs/files/sufenode.pdfIn PDF document text
    • http://dnepropress.net/files/file/30852997036.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/49135057416.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/rawobapedapozupevuwar.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/34272030393.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210908100509.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210902112642.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/7731993019.pdfIn PDF document text
    • http://pasted-radio.de/web/files/kolexezozaxefapulawokile.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/89948413604.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5c580ee2---puxuraxizubu.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/zixerewejotemex.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/dijimolaxevopipew.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/66903903723.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0b90492fde4cae457279c45f71eb0ab7/sibopevun.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/rokukilenapija.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/julifobema.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/50595154580.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_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 15964 bytes
SHA-256: 2e671ca6f9a52dee896a7adecd6bda7ae051e39a1f8855d911dec67ee3d5504a
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 10696 bytes
SHA-256: 928c55b4b3e1088c995e9929aacc27f85cf2f68ada586e0cb08c5d61a4fefc33
font_02_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1