Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05ef528553db685…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 11:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03039292d02dfd27ebb1c41b299ded9a SHA-1: f7f3c940792e1df9b514cb586ec54b5fe485bd5e SHA-256: f05ef528553db685095db6ade3683c67bc5a747c1ccae7068d6135377f347aef
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. The presence of multiple external links, including one pointing to a compromised WordPress upload, and a heuristic indicating a 'download button' lure, strongly suggests an attempt to trick the user into downloading a secondary payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nhungbaithuocnam.com/img-tvdl/files/71176943109.pdf In PDF document text
    • https://martabaktelor.com/contents/files/fapepir.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/tiveruwuwejati.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6994a9687---19200105591.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/8938505460.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/rokip.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/90491004757.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/riwazodasavizipivos.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/vomesanevop.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/barapumiwekinofabora.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/58014091911.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/64340317078.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/42256355184.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/31198778775.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomosegik.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/debufopebuw.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/54355246740.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/misuzaza.pdfIn PDF document text
    • https://12shio1.com/contents/files/ditipifunanote.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/97903798440.pdfIn PDF document text
    • http://beijingteye.com/upload/files/bexujoretizifufefejinod.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/27189789031.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/f4b74bafd28b1162aa58788f5d5fa2f4/kegiralubur.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/rikivarutenabenukafixipom.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e59675a85---getubemibitiruxedolegesun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=apk+export+downloadPDF 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_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 18736 bytes
SHA-256: ad7a466741440d8c04130d7b945074e24017a75a89bc2e57a92c0c1dcf9a1bcd
font_02_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 10384 bytes
SHA-256: e42df9dd6b7101d79b0c5f7f15f7979fcfdb03fa2f16ba1d76b2364de3677d64

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