Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7d3a619f2549f3…

MALICIOUS

PDF

103.0 KB Created: 2021-09-12 18:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aa08cc5a6eddc3659af8cba2e2ef8523 SHA-1: b4c9b4055d560082e835f09c38a1c39ab111a2dd SHA-256: 9b7d3a619f2549f3705d3dbb89e878ff08ec6afe7bfb80bbc68015f47721a024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many pointing to compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF format itself often leverage embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://philabc.ru/uplcv?utm_term=remove+root+from+android PDF link annotation
    • http://poexali.org/static/image/_u/system/files/58643390548.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/sowudofuledeb.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4d756ca4---77964460031.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/fumezavaronitoje.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109121020156832.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/penemujogoditomuf.pdfIn PDF document text
    • http://amkchem.com/upload/files/jusexumubofububek.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5c47f52ef8f983f851732aadc7be284a/nakukexe.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/mebawutipizakiwulejot.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/58159064785.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/retatigefigur.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/24103605078.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382ec032a5a---kirodefafebedunukizafaz.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/56289729329.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/060954536590.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gonamubomi.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/81638955018.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32172136712.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3jod336k334mteu8ua6t3doqfp/kefiza.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/57836382661.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fd09c66baf6ae9f1f5fa2a73ce6c4dc/5121522055.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/84463393974.pdfIn PDF document text
    • http://www.agot.pl/upload/file/sekirikabipofuwa.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_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001459a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459A 10412 bytes
SHA-256: 7fef2362bab73ab11035febf53d6d4fd757b94f0cc1f143caaedcf0dc1e0e13d
font_02_sfnt_off00015d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2B 18732 bytes
SHA-256: e4f50ceb51b49faafa9e6a094032e72bfeaa60ad9ff63bbb00b0d01d3b9f9024