Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1a9f0e5e634c72…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 16:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9aa3410022eeb5098c3d0b764a3c3df2 SHA-1: d55b3f0da37749cb9f248e9cefef9218034520d3 SHA-256: ee1a9f0e5e634c721b426ec9c6a291f069639d218e729efaaf920d3de44fa6f5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's an image-based lure designed to trick users into clicking external links. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://remoteyourstaff.com/calisma2/files/uploads/wotutupik.pdf In PDF document text
    • http://yztools.com/images/upload/File/dulafemikoxotakanirapebon.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8f7a4933f458e4021513f72f8677216e/28284290420.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/73977695423.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1da96c7da---romekewevusana.pdfIn PDF document text
    • http://baove24h.org/upload/files/pabakuxamitegolul.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/64640437159.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/83307480007.pdfIn PDF document text
    • https://mkontroll.hu/File/23352589816.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/92630801369.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/622748673.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/tunegodu.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/13053893904.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/fixulekipisuratoborexod.pdfIn PDF document text
    • https://transturist.transturist.com/ckeditor/ckfinder/files/files/gopelilitoronelirovofid.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/3333147228.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/70356035559.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/44020499479.pdfIn PDF document text
    • https://everestart.com/images/stories/file/63497874682.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/23485505210.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/26212660356.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/gufafepojopunevevivakib.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161511e13d7879---perofarasovumujeguneg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=std+10+geometry+textbook+pdfPDF 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_off0000b033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 10968 bytes
SHA-256: ee9c1332e086e0dbf6af9dbb5a2596c57afe24bbc7c8d41b363b4064e17406e2
font_01_sfnt_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 14640 bytes
SHA-256: d83ed8ff84fbccf5676d852fbd4fdaab26353974e3fb35a7bd6c18ad38c015aa

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