Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d09e0ec9077004…

MALICIOUS

PDF

98.0 KB Created: 2021-09-15 00:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67684ea3f25f8982009cd7b385405781 SHA-1: 0f79b5f4facf3465cce88049facd6c19a07259bb SHA-256: a4d09e0ec9077004355ded368802d0a12b0d5dda525488e2a3c9728c2fd38041
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the presence of multiple disposable hosting links suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the document's structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1614111f9c1b75---vadosot.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c3f65bf433083322ec0cd9a2832ce7a1/nawuti.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xaziso.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/83890476293f75ccfb8d9933623009d4/jimexabobanoxuwor.pdfIn PDF document text
    • https://servicepapik.ro/files/pilamodebatowukuri.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/18807140158.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/zejuranopebaropuv.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/kadajaxorunetapeduxuw.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/fepugizavotojalagebapewet.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/27190867408.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/18031652351.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/18904256556.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d4d2c95b---lulabobunefizotimawe.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/kodupizapina.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/wobipo.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/30674230740.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141117a3e2fe---mivasojizis.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/nutoxodikedanesasura.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/21090315293580470667moo.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-9/20210909030502544841.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161330d254eb6e---13973241218.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/54660141222.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/gotebexapodokarisirif.pdfIn PDF document text
    • https://buka.ru/sadm_files/bepede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=walking+dead+season+10+finale+free+onlinePDF 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_off00011999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 18280 bytes
SHA-256: 38c56f8d6fd0575a7f1746857d1b26a6c74d88be33180c2afb7965720b5c5e45
font_01_sfnt_off000149af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C6 10688 bytes
SHA-256: 88c605691a12edbb9b3c40d7affadaea7d81bd56abf6ed04bb02998e9aec3b36