Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfea40f12219440…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 18:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cb71374b2775f8758746428bdb0dc2f4 SHA-1: 505681a2c8d57bc5c4d915a344df9fdf1413b240 SHA-256: cdfea40f12219440efd5b922e6060c3d0c17e014bbb09b1fd512a8f717511ebf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms points towards a tactic of using deceptive links to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=dota+2+mod+map PDF link annotation
    • http://discus-rus.ru/upl/file/35416950814.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/tufejadakel.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dogajovifozozapa.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/bukanegoworenotisi.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908002624.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/33843135485.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/jobefolebenewunenisin.pdfIn PDF document text
    • http://spiregene.com/image/files/20210911_201815.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/70949469900.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/82506303235.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1e468c5e2894f2d21e8c3264963a587d/37401707559.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210916032142_770257080.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325bf44ef09---sugebijoreragalu.pdfIn PDF document text
    • http://redactron.com/userfiles/file/biwotedo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4ac563d1---sudaponorodufiw.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/nekivijibumi.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/58102560286.pdfIn PDF document text
    • https://31app.com/userfiles/file/kujavolenakimujobofix.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091714374470554.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/revobusivonutelomat.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/wimifovodozazoliv.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/69715139137.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/45678699450.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/bizazu.pdfIn PDF document text
    • https://cubic.is/userfiles/file/50984771528.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_off0000b335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 10032 bytes
SHA-256: 705e38f582ca1bcdfbb49b2b234e8bb77cf1f8357d8a12eb4427e25729221b7a
font_01_sfnt_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 17268 bytes
SHA-256: ba2221734bc12d10dd40d24adff6015b4bab54c1809229144843d6d33e07b588

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