Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03fc32675d81f1d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 05:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a69b4ff0a2f7e78237c7236408cc4539 SHA-1: c580ff236403cbe8dfad812220f55245469f1d21 SHA-256: e03fc32675d81f1da171b2811c4cb37658b31ac5acf6be41f7e449c89d6b0ffa
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest an attempt to lure users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://strahovka66.ru/userfiles/file/zavafesilol.pdf In PDF document text
    • http://zhfangyuan.com/uploadfiles/files/navotagunapa.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/limazunoka.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7bb07dd09---49512387933.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/53911503184.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4e7bd211---lefotatikawurufurinolotap.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/32217650620.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1f3dd39f---monudipazozapatumek.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/sufegudesemomitagapa.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/jizanisevixivodef.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/zetukevurisinuvesizase.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/sepalesel.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/kifusoviwasi.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/66725793964.pdfIn PDF document text
    • http://usateatop.com/_upload/files/jisuze.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/32551996291.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e75d45ffd5efcfc02181c5a830292530/woxedepixalarinugu.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/nuwejuwoluvakukove.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/27268626384.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/70162427007.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f2ea84f5---sakarejeredivobev.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/52710658019.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/4669596814.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/zejukenosegobajiduvama.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210904044920.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/44563301128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=homeland+season+8+putlockerPDF 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_off0000beee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 17188 bytes
SHA-256: eafece5c02b979af1c3e66a61e73e54c516726ca1d2e4a95cc450a2eaac45bb7
font_02_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 10976 bytes
SHA-256: bb1e5c9bf4fc9c89b3c343d6ca9814e56f1ad0aa64f3b5c63860329432a9182b

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