Malicious PDF — malware analysis report

Static analysis result for SHA-256 209aca507ac5e61d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-04 21:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9440016685f68777a3e990d7433958f6 SHA-1: 41308b7708672849e8c82657f77bcd3be457320e SHA-256: 209aca507ac5e61dba05c11c6aa3e19f28bf9a2cf0e9988b16f2870295bf7dce
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior, suggesting the document is designed to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://akapacha.com/userfiles/file/80435695013.pdf In PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/fonolipixoguxipewif.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072582c64147.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1c5c49853cd6410949d49783fd65a878/35030139606.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/39597473175.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac3c6a993---bewogetedamilodaf.pdfIn PDF document text
    • https://ms1oke.com/contents/files/soxuzuzawalumusosomojisug.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/77077533637.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/xuzexitemozapixojuvix.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b151ae7b43a6d181d3fee1bace8e7a2f/32120615458.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1c84e2460058506c3ebf980ebdb17391/sigibavabifidi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/semurijunujalifep.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/tibagawigotulurajibizivir.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/17617240960.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/64891441398.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/85f0d2bc5132f0f5727918727fbce335/sopimebegiwurakumip.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ce65b6d86---jibusukawojuna.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/pujebamuwifalagunorarepaj.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///8365956660.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/70307592020.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/43477778134.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/1119690373.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/penotisipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=present+tense+of+verbs+worksheets+for+grade+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_off0000b384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 11000 bytes
SHA-256: 1f7d85b1ef333b5e9a041399617b1a967e059fbb408fce3a222d28886d33b2e3
font_01_sfnt_off0000cd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 15716 bytes
SHA-256: 2e0a9d2c065431d63c26f94309a15430ca21c1369f868abe5d35ce7fcf8ebc10
font_02_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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