Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b02b76490c6c97…

MALICIOUS

PDF

88.6 KB Created: 2021-09-24 04:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dee1cbc9570d9e4e6ce0c6cd147e4777 SHA-1: e527fc201558bd04c1fdd27a611d3347cfcedb73 SHA-256: f4b02b76490c6c97fbbea8a3c6443f13c2fd6c1f8b65e09fb6dbe26e8f841efb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting domains, likely to redirect users to malicious content. The primary attack pattern involves luring users through a malicious link, potentially disguised as a document, to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1a550d1b08c34c80093e49fd4f865339/93501365367.pdf In PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/xepisimevotikilozewogopu.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/woneripemufe.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/ziven.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/27082798892.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/63861721468.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/73589301406.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133b73ab98b2---furibitirorizupop.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5b9ab168---45345072166.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/73416049302.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/84316650022.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b82d25a66---xukosukuzovulegat.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/49656649529.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/22727757760.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/85539057144.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/21021796686.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/lasovuzobalafexafufagejo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/e1kukgd46qkrf3bej5t0hkmdt0/komekikofalamikik.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/71123131263.pdfIn PDF document text
    • http://netflor.pl/upload/File/rosunoparowimeg.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/32698699134.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/zilifapozal.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/56631850445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=midkemia+world+mapPDF 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_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 17896 bytes
SHA-256: c7d50c1dc15f5b149923a9b326a265f268b38a8b60d0831ca2c6972de57d58be
font_02_sfnt_off00013d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9B 10356 bytes
SHA-256: b094cf21ce41f5d6374ab342bfcb6b33b2155e7c5131cf199178fa8eba423b9e

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