Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00540d887b391fe…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 15:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc3f1d46878bbeef924dd8e1c23217be SHA-1: 56a6ebbee03db32e5f41aaf13aa96547e44a1cc7 SHA-256: d00540d887b391feffd75179e06cadd3dbf5c7bf2a5ee5ef8f1c9cd85ecadc90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that redirect to potentially malicious content. The presence of multiple links on compromised WordPress upload storage and disposable hosting suggests an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=apk+gta+san+andreas+apk PDF link annotation
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135265e832de---dafizakusisefaxawaxuleja.pdfIn PDF document text
    • https://iwistw.com/upload/files/15496242388.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/tamavewogoribexiwureta.pdfIn PDF document text
    • https://majubesar.com/contents/files/sopinabasizuxuxere.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/vonomopip.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/debilabozotefila.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/48396123080.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdc31829d---tezatatesetuz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad5a431e---nusinebikotoxad.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/39274689740.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/50870929977.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/xejifiditalubonisuv.pdfIn PDF document text
    • http://wmsone.com/eimages/file/vapiku.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/2559649166.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/15638545106.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/gavupetukakivigojar.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/44466421011.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/40931323387.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/81691147166.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/11922077030.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/63164130334.pdfIn PDF document text
    • 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_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 10380 bytes
SHA-256: 58e1fc2f58a8e0e9c2e40cdd2e31a0f1469caff06048b3f2aae428a65242825d
font_02_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 17480 bytes
SHA-256: afed8089bd2d23b74e133375bd276918a2462ec11443a58304172a7ced139d50