Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2e4b866b3d3b04…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 05:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 915fe222551cc982c0c6d38c87f7e0ed SHA-1: 12856155adda03042b099f92b7f5dfcc7d846955 SHA-256: 2b2e4b866b3d3b04b2dee1fa413966b6f97985fdb9fe61055b0f8e730c9cdab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage potentially untrusted hosting. The file likely serves as a lure to initiate a phishing attack or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/garulevotebemaxamajuxafo.pdf In PDF document text
    • http://chickendaylacrescenta.com/uploads/files/rewosi.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/39702196158.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacffea6eb---87624066873.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/mikavonugux.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa1a30559---63159200372.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902093414171.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210906042232.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/91658614961.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/56746992422.pdfIn PDF document text
    • http://polipack.ru/content/file/rafopamule.pdfIn PDF document text
    • http://myslizdrave.com/soubory/15422335936.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/67056090837.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c170b4f4---11464936916.pdfIn PDF document text
    • https://onwater.my/uploads/file/patepuwaganekolegelulelom.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/luvubagofisiwulama.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/sefaporipufukix.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613027714cc8e---levijelirutuv.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/zokipufofekokubobovux.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/buxiboriwoborofonanejasus.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210903/files/20210903161808.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131040e37e6f.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/52458802342.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3a8f25d29cb8155df70d86b22b61d2bb/7380484844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=unlock+pdf+androidPDF 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_off0000d08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 17196 bytes
SHA-256: 41ce9b7ac3e9db2786aefcef45cfce585f58e2a6ba5a0366842c218b350cc452
font_02_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 10316 bytes
SHA-256: aca2a2d0d6a77f3a5ae31428c2be6d8506ecdb435788a874682be27c4c146a7b

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