Malicious PDF — malware analysis report

Static analysis result for SHA-256 511095fce0945c66…

MALICIOUS

PDF

99.0 KB Created: 2021-07-13 22:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 326e1f58e149382acccc2c52dfef0fc7 SHA-1: 28d0043d5db710e23ea5501cdd364c5a9221152a SHA-256: 511095fce0945c66ddfdeef0743185985e03a3a4af1239674c3b999b61cba382
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to numerous URLs hosted on potentially compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9326

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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad57bdc793---43747763786.pdf
    • http://skpizzasubs.com/uploads/files/xusinifuvemabewitupe.pdf
    • https://egyptsuntours.com/userfiles/files/42386830125.pdf
    • https://bbpartner.cz/userfiles/file/sivokewun.pdf
    • http://dermalab.pl/userfiles/file/33942285699.pdf
    • https://ka-base.no/images_content/file/nirolamixetorapaguzu.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62cc721942---33184524552.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c261a6ee0c5---jadukegujatevaju.pdf
    • https://z87992961.com/upload/files/20210709103802.pdf
    • https://matskaren.se/anvandarbilder/203/files/62541417231.pdf
    • https://bkht.vn/userfiles/file/54800250783.pdf
    • http://ototavandosemesi.com/resimler/file/33856882676.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/07622239bf17f004ddb5b19851c8ae53/kasejoxaviwari.pdf
    • https://egokituz.eus/files/galeria/files/lupuliku.pdf
    • http://centronegozi.com/public/melubonurid.pdf
    • https://fanaf.com/article_ressources/file/39692937517.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b020848eb45---58366655735.pdf
    • https://cplastik.cz/data/cms/file/81430445418.pdf
    • http://myphamnanyno.com/luutru/files/fexurege.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6df6bdde8f---61557157841.pdf
    • http://ckpak.com/fckeditor/userfiles/file/wonixutirugirilagivujawo.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d8416be4---xilewejujozamijobuwemin.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb0f4e0ac---ligor.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d861c56f75f---70216996378.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8e9fe6da1eccf858dd212b18fd4a2a10/51413886041.pdf
    • https://cmsschoolkg.org/userfiles/file/ridusagunotako.pdf
    • https://nikosdimos.gr/userfiles/file/zuvisaromusuzu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=yawn+meaning+in+english
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf6.bin
bad2e2c99c47ba97aab98fd91e713e26d97aee296bc6f22fb71299684d4530f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 3016 bytes
font_01_sfnt_off0000f79e.bin
3233012e92e3920fde6e1b6f8eef1910faafe20c6bcc84499eb3fb62b4c6b90a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 24776 bytes
font_02_sfnt_off0001353c.bin
5a5a9aefbb80f48170d9336b4139e00b7a9b348ebca0abf3814906b1ad935dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1353C 16792 bytes
font_03_sfnt_off00014d13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D13 16792 bytes
font_04_sfnt_off0001652a.bin
cf4d273e15610a5acffb1ee6bc61d8abc335f0ab12dd6a52c214ab6c8c63989d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1652A 10304 bytes

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