Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78ebfd0c1606ef0…

MALICIOUS

PDF

96.3 KB Created: 2021-09-23 00:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2632c75a18584f50322871445ba3e80a SHA-1: 1c5aa0ff850854cbf81850466579d4fcda75c5a1 SHA-256: c78ebfd0c1606ef0a504f59e275d0f719c17bd6cfb71a282f2912566252e2e28
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests an attempt to manipulate search results or distribute malicious content through a network of links. The presence of URLs like http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecaa702155---pezekikaduletibaxejebo.pdf indicates a pattern of hosting malicious files within compromised CMS upload directories.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136599a6a497---nawonenudunemedekalijuje.pdf In PDF document text
    • https://cmottaviproductive.it/uploads/file/lofogagufuletibaxejebo.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/1408019580.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/72421795923.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/gonamobefifejixa.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/kajesataxagikatutesonez.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/najipovixubo.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/zepuxiniduzubaluxomuj.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/32929569301.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/zitelopemorenorupoku.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/6dfc458d59e52d9bb1e94f726f92e9d9/pavusujemobi.pdfIn PDF document text
    • http://rsentco.com/upload/file/95288502457.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/7821423456.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/vizepusojukumep.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/27585976233.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/72438214887.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/jijijosesosijufexok.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/subogawivobisiwekabejut.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecaa702155---pezekikewa.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/61847838564.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/rotazutepa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5bf670f17---vupugedupelogatinugo.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/kutezoluxedumupomog.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/buteboned.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/89083747021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=my+talking+tom+camp+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 16364 bytes
SHA-256: df5a9b3fc1d8dea4b54e39022192989705558d8cf81f1cf77482b76df6e3d4ad
font_02_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_03_sfnt_off00011908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 25864 bytes
SHA-256: 364e9abb42ae88507676b379a666cf3fbf7aa0f9da9c0ee0429b7d804410bbbc
font_04_sfnt_off00015adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADC 10516 bytes
SHA-256: 5b7964c2b21a03ded4fe11b1155557736ade4719721877b335d7caa74969dd97

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