Malicious PDF — malware analysis report

Static analysis result for SHA-256 8843e28e1919b677…

MALICIOUS

PDF

68.4 KB Created: 2021-09-08 20:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e35faa0a8f029e55ba3a34d386372505 SHA-1: fe0ff9b8f50d73049577647d4bcd8f3f71e9a683 SHA-256: 8843e28e1919b6771e3da7cbaba3f7454107c37964fcb0ccc0e70f47b5d377ac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and containing numerous embedded links to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content or initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=klasifikasi+sindrom+nefrotik+pdf PDF link annotation
    • https://ev-owners.jp/userfiles/files/fovowunibapodulemuxi.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/gabosujijo.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/sarexopulinajava.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/xosapiwafinelomeluwaxow.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/62522325213.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/nituxobibuvef.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/58f8cfa2fc4e42f8b0ae3f7091baea24/91500276148.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/22698014124.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ab11b4b6---kaxoxonakemo.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/sutojijemegivibimirak.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/20849175843.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/gelupiturivetafukesunanu.pdfIn PDF document text
    • http://ud2-140.com/files/nezugigife.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/vopejojepomupi.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/11388073936.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1ad25e35---rivijeturezanazerefi.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/71931594715.pdfIn PDF document text
    • http://naviway.su/upload/files/15717964315.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/lakebikuxoxe.pdfIn PDF document text
    • https://pr-dienst.ch/file/vujiwajov.pdfIn PDF document text
    • http://kunbot.com/upload/files/juwekuzupexedudasiruro.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/23c307f78c4a470bfb95e0d9588ceff6/tamudatudukinawap.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/rifafijazokagakevujo.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_off0000b0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C4 14020 bytes
SHA-256: 5c5d2de3efff498fd98501208f25f4d37076630231f1666dddd7327df4dfa304
font_01_sfnt_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 10740 bytes
SHA-256: b7b3ac9125a6eafcd39aae27d43871400b311e030ec0b662258f65f77f86e6d4
font_02_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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