Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e79e8ab130cb36…

MALICIOUS

PDF

75.7 KB Created: 2021-09-19 08:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fea0d235ef11b3641c6a237c1bc21224 SHA-1: 9a54ef683a4f165f3b22cf4374e8e151a49ea47c SHA-256: 85e79e8ab130cb36f2d78e193bccfe68cb4c904f98d807d2afb48f7a69fd2a93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.peltonfell.org.uk/ckfinder/userfiles/files/82406558131.pdf In PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bde3717ab---19979461693.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/dobipizekigi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161360393097b1---zoxovibijadaxakixute.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/89663307555.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912045949676653.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/62000579400.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/98443359261.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/16825814068.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/82540057636.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/nodititexuzufisofudal.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/nowetaxezu.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/lavozigijabejibor.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/novuzewidomagaxolinusisub.pdfIn PDF document text
    • https://landi-bg.com/images/file/zerujelelozoxedese.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a32cd6e7---1094156229.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/9612271354.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/90061210910.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/wurel.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/28183676910.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/wirunukodovu.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/xozufexobupakukin.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6132923CE055E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+download+android+apps+on+my+laptopPDF 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_off0000c375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 17532 bytes
SHA-256: fa7c466a7c0e62b8dd44863c6c7420a5941021422ef4cbba770a621d393466ae
font_02_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 10612 bytes
SHA-256: 429e040729be7f5b924cd08d3daa4c407c67a323ca2c70e291f909251723e800

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