Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fc6098d71ced33…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 10:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6491c596fe73c93e2113da84859e124d SHA-1: 912f200f3e022030117a3eb0fdcab00b6630eb44 SHA-256: a1fc6098d71ced33111ea64fa38c6decfdfb984e698a07efc888546c5359a5b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://dkmmotor.com/files/userfiles/file/xufatibuzufujage.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb755a3fc---mefapiberigadojibewajox.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109100713033918.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/zojikivotebobumorum.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/60070285377.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109171157494127.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/64714780342.pdfIn PDF document text
    • https://adikmanis.com/contents/files/lewatenalebijiwuwamokikan.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/29584307224.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/37343504938.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/fipoxanivaridirubarutit.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8b393c5e0f3188d145d7224f520b8d8d/81761844913.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/53243361489.pdfIn PDF document text
    • https://istanajp.com/contents/files/gedejikapoxugudobumizin.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/21559797499.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/vunagisisox.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-07-01-57-23-87.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/fujogevumilivote.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/julikizugapivuwarorop.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ximudujujopemivon.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210910163707.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9bd402b71f894c34d4d943df680a42b7/deximuv.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/rorezapewa.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109122047124379.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613663a30975e---77126888369.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/65028133882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+lock+gallery+in+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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 20988 bytes
SHA-256: 7d3f5a835ceb28524d5aaef98cad99906df672368b98606680515a8cb7cd2e5f
font_01_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 10660 bytes
SHA-256: 0c74f3ff958074d2d59527613bdf96c648e44d1f97b863962dafd7b16b6e9f3a
font_02_sfnt_off000131f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1