Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43ee59f003e3a01…

MALICIOUS

PDF

84.8 KB Created: 2021-07-26 23:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 441e6cc3684084f72d6fc5db6a7a8581 SHA-1: 9a3c4505f3470e03bbb809b941fce5b709d9d140 SHA-256: a43ee59f003e3a0173436b671a4c33b76c0665b60db67cebce46861120ec3bae
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of numerous external links on potentially compromised infrastructure is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9p1uhmb3ai7vbrnccunpgevf32/26993702950.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/bpv40odk1sb87nf61qnsbempb1/12618469814.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/tesejiwizipakojasidogox.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/pulolaradode.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/fujaboxejovukaz.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/23573383451.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/8dsk74c5fnr4bro6u0bul6as78/28565764505.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/45702516038.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/weduwinatabatuvisiv.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ulos3mqoc4d5kmo61p62cpo5ea/somufakika.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c177e37af9a---xifojenidilazonogudube.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/55259830219.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/ponogatozazozigodibebete.pdfIn PDF document text
    • http://erictex.com/ufiles/files/rologirubobuvufajuzewafi.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/wufegabizagako.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7e89b1bd590c3cf94350b2402785c22c/munofegam.pdfIn PDF document text
    • http://zzweien.com/d/files/zalam.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/vojosopadexa.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/714b2b8eb2fcd9b647cb0819ebd5c2c3/jokamuvakejitumurajafo.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/fexojiduv.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/fcedfe58a5531a002b52bf0057464599/1009712655.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/70755522649.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/mabif.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vopjf3inav35ganl3nr7idrhc5/64957768974.pdfIn PDF document text
    • https://parkettworld.com/upload/files/sifefugever.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=upgrade+list+th8PDF 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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 10660 bytes
SHA-256: 555a0df33f0dfd3c804a594c91a8bfbd45178be0ced98c6ba8ac1ef9608dedc6
font_02_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 17244 bytes
SHA-256: aab909e7bc8aa5e90ce092e551bb51d2bdcb1f98be2d35aad170dfeac168a829