Malicious PDF — malware analysis report

Static analysis result for SHA-256 803e617770f7a416…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 10:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9bf14b04a694b4a9edb759c1dcf63ea4 SHA-1: 43beb65c31b1ae4c5f5ab88b1a003c3bbd285ffb SHA-256: 803e617770f7a41693c640903c4d1c5412e7e7694e659495fe58aec2a93a2317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm, with multiple URLs pointing to other PDF files hosted on various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kengosushionlineorder.com/uploads/files/46459936639.pdf In PDF document text
    • http://www.bash.cl/media/file/18353537844.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/53613598431.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///84453019531.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd7ccb7dc---21643182524.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/gexexopikoregesidafoka.pdfIn PDF document text
    • http://wenxuezj.com/images/File/90247948599.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0553560001631278899.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/76705896437.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413c20b7be6---9378299430.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210906105404.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/21319954998.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/laluvofanev.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/dubiwumedabifexagewokexu.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210910085320.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/mivomefiwovubonosifap.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/wopax.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/45393170734.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/16892254951.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/kosetoxikezim.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/94775335923.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/55dsj9u3ddelb4de5fau69em83/sakomexileropur.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/mezagisozudakuni.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384b94795ed---baroritisukemavivelibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=robot+unicorn+attack+metalPDF 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_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 18092 bytes
SHA-256: dc39a89b991a84bdba75f60f6858d94f467e6bf3601470b37c44670c3fbba0a2
font_01_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 10600 bytes
SHA-256: bbaec636f9d5a907c8b022161dd61a709b9c1a4e3b8a2cc0e3a92085b1eb084a
font_02_sfnt_off000128a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1