Malicious PDF — malware analysis report

Static analysis result for SHA-256 1017e3625a94c6c5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 19:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a05443fa70fe77fa2061dc1192c88b5 SHA-1: 20a11a839b13490e3b8067e4cbd7d8d2c750e7c3 SHA-256: 1017e3625a94c6c5920c8d5cc9ce6a39b33dddc1f65a36b24415ae81836e9730
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

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://synerhu.ru/uplcv?utm_term=minecraft+latest+app PDF link annotation
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fofigawoxukifaz.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/90121042784.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/zifuxitosomokavazag.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/92115243025.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/47426853938.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/20958041377.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/9111119211.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/kuxowulimeg.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/53419987473.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f09078ac9d---zusifitonolu.pdfIn PDF document text
    • http://klaaswester.nl/img/file/mojixel.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161317dfdbe336---parebaf.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/30831172066.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/42615464030.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d2e53d2e---tavose.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/gesaw.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/68704210790.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/9036098973.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/muramepavebal.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/rinadalorikilesuzamatos.pdfIn PDF document text
    • http://kasand.com/userfiles/sowiboxanogojozijipigiv.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/96670672749.pdfIn PDF document text
    • https://dukupahit.com/contents/files/sidazujujolixorafexotifu.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631618858.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_off0000d34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 10348 bytes
SHA-256: 1a0e68151579c6e8ae6824ac3f31ae996551e5731675e29246d5d48957348147
font_01_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 17192 bytes
SHA-256: a2f525e499434eaf0cd8339f19ce6565e6f92c10b2eee3140b6067e1d733f73e
font_02_sfnt_off0001174c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1