Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d9c5d0b59ccc91…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 02:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f437a0be37bbdbeddf9a303f5084a34 SHA-1: 2877074e58d3f1788fc61609fedc788e8eb732d4 SHA-256: 39d9c5d0b59ccc91a3eb78edc50ad47b1cc471d5dfb07ba2e4206196fcf91e4a
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to potentially compromised websites or disposable domains, 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 URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to lure users to external malicious content, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=animiz+animation+maker+apk+download+for+android PDF link annotation
    • http://gemaeldeundobjekte.de/uploads/files/xanawemujisi.pdfIn PDF document text
    • https://ocw.tw/uploads/files/katijazufoxowuga.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161323fd7c7218---35054113449.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345afbc0359---6747953203.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/64628184036.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/5318333196.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/xefuvo.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/bevogitotoboluzopelekapuf.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130420b121d9---85750519975.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/mawukejepatogugi.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/19323317416.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/xavujuxikabavelijo.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/27793788064.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/5820000830.pdfIn PDF document text
    • http://nature-revive.org/files/file/mawoge.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/81419217933.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/696bef0f5715ee8efb393958b04034ad/gevuk.pdfIn PDF document text
    • https://satesayap.com/contents/files/21105807158.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16140349406b5d---kukodevep.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9814967b96231d9e033d78317981a98b/pujiralotaleramotizu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xezosebofuriduzadanisi.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/63054256143.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/78914705857.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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 18584 bytes
SHA-256: c43347eacd5a49d8da15d45f9fa39f155ff6450af38b0096f4d6319fe44c7b2d
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 10712 bytes
SHA-256: 50befabc389322e0ff5db8a3dd0f253af32455361234aaaf55ac3c7cc37028c7

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