Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef889fdb6c6d1308…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 22:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e58c31b4d38bbad2903e198a9bd9680 SHA-1: 57a2151ef9b508211f87f130453c1e6c0ad4cc8a SHA-256: ef889fdb6c6d1308de93bbe35fead1e8cfa6eba96f2bae678b4a6267cc21e223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bb374c668502a299bf558ba7ca84b6e7/rujaxekadiwisemixogi.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140db6e911c2---nidojunapor.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/37711660785.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/gitonorepe.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/860e0b9517679f76775d92ab4eb0bc9c/litaw.pdfIn PDF document text
    • http://billsky.ee/files/file/nilasepopokitawenejes.pdfIn PDF document text
    • http://fivelscope.net/fckimages/jelatisufogozanubedav.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/gazovabovo.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/54974661687.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210915235611.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/duxuxodigadu.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/panizimirezedamiverudapa.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/zesorodojibupinokos.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/13872950028.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/68997071101.pdfIn PDF document text
    • https://togeltop.net/contents/files/naxazagakita.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/fularadewukakuwepo.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/mizobutoxetumibusomos.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/57339713935.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/kikugoxagafoposexux.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140901fd0569---tiwavulum.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0c2721d3e80321686c72ce66276be63d/18932717933.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccc9ec56d---boxumuzilo.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/62873143959.pdfIn PDF document text
    • https://kawanmto.net/contents/files/30171452516.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/nusexigowuneworijur.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/9865456035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ranch+simulator+apk+download+for+androidPDF 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_off0000b321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 15124 bytes
SHA-256: 8fdc97e26a7041c91c06d7e8801ae29d00a22869950ae8606a1334595ef23cc1
font_02_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 11076 bytes
SHA-256: 0d4d57a15ef2b8ff766e30eaed994f3012fd0c6a4b61879e5d995466a5d2ffad

Open this report in the interactive analyzer, or submit your own file for analysis.