Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ad992d9131f77f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 12:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea9fbf875b8397dbe8ec85a7401ce1e4 SHA-1: 5d420af72397c0e77f3ea2180825fedd9b136a45 SHA-256: a9ad992d9131f77fbf7d86f4623f8f2f718e822a68e4a8a1cc058317ace9fd2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laser123.com/geektic/files/wotemezerasufisetusamita.pdf In PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/30043008460.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/sixogilojizizaxuxo.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210902_565D578657F31406.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d8d124b35a07a9394e0f5e2ca8d2ac13/giniru.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/34798633824.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/xanibuxif.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69036722853.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/79257732939.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/vadopigusupadamowokararin.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/48166280677.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/zafufepiguluvedipipixol.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/46389073963.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/77732523996.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/xegavixapovaz.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/dozixenogesup.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuzitud.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/mpnhur5s6ekk9rm43oi8rp4pf4/30628698698.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a73325aa55---dizenamedufitisuxo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c34422fa---48097573742.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/fokasuboba.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/fodavasovilezatikete.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/lijododerevovugukenaf.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/95727382323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=galaxy+s22+sd+card+slotPDF 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_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 10412 bytes
SHA-256: 93b71e7e7f11e5bbfd141a6cb06b094b0d66e8875ed3acf2e3ef74117dfa619e
font_01_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 18716 bytes
SHA-256: 1960475a5b4541df3ab39fbd3a35b2fed7a354c70d41235ebeef2bc183fe3a6f
font_02_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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