Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e4966e999b5652…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 01:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01815ac7dae08844444866cb735db665 SHA-1: 4a42480ad5d2b5071b7e50c9d444ee9f7a17c4e3 SHA-256: c5e4966e999b5652acf8dd5562f04f127ac56dec38b7c1d1f267b20568e85918
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to numerous external websites. Several of these URLs are hosted on compromised CMS uploads or disposable domains, indicating a malicious intent to distribute further payloads or conduct phishing. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd56c88580f---32845290509.pdf In PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/jakamabitajiladiwida.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/dagixunazoresi.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/paledezal.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/kudirenuzovosep.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/58518073599.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/petojinas.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/mupebinavutupafenewapopa.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6899d8c2---91279421173.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f54769a03---1089129551.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a84b2b2e85---zibemonosemofafurotukuw.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/11398751122.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/niveripibipu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cca5721262540ba341a1a8f8107f7b8a/98461976416.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96ce810500---sasifunufamifa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a733088ac67---vupalaguwelu.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/kepowamirarageniput.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/34634088189.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/71043049018.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/beb9298f1aa77aede5bc07728f56db78/65290158186.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/542f8thfeeqicc72f10i1m5phi/54598023950.pdfIn PDF document text
    • http://iccarrentals.com/files/file/30564341608.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124b7554e028---74577626356.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mgtn8ts51ncrp4184m7obnkurq/vujarudojivopibopeg.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/81546466425.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4d1rf2po9m7rcuit71hoo8smhe/3128133045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=absolute+value+inequalities+worksheet+answers+algebra+2PDF 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_off0000baa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA0 15508 bytes
SHA-256: 87a1db3711214c394bc69fc5620024cfffa25bc9d343044df46aa030ded41238
font_01_sfnt_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 11116 bytes
SHA-256: cbfec4cc8b9d54ac852e51ac8a14275b417627a3153275812673dcc6d3ae1d38

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