Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe391d131f7bf16e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 00:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 885f1addcda26c6ffc538f6466369dfc SHA-1: a8fb0484d0b70ea370a044232bee455418858fc7 SHA-256: fe391d131f7bf16ec3caea9d28fa7edfa7fda837546765a6ba782c27caa912b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest potential for JavaScript execution to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://henskeschildersbedrijf.nl/upload/dewarizojer.pdf In PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/59241945457.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/kigipuxobemuzurul.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309b0a78658---8051036501.pdfIn PDF document text
    • http://symbolfoods.com/files/file///bibogoragofaten.pdfIn PDF document text
    • http://creationart.hu/files/file/darutinogunogurilimup.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/ridumomisujonadaxadox.pdfIn PDF document text
    • http://rayanchem.com/d/files/94889386796.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010226d1c3---61587214452.pdfIn PDF document text
    • http://chayka-svg.ru/files/72113585556.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/88847073124.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/tosiriwitajewosok.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/gisaloxiz.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/89226712751.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/namofulobawinaf.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/92164310309.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/61855968521.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/magagozanikobagaxaj.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306a8213f52---jeruwote.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/55512535429.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ooe1s4gdlkiqjjk6s4bg6cjke2/75759798468.pdfIn PDF document text
    • https://ferropula.hr/files/10311781453.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/jorilifa.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/zidaperunumulirix.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/zogelawolikivim.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/17513684041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mc+cookie+recipePDF 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_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 19024 bytes
SHA-256: e530e35c4424236ff77116afa72210442b56f7ebdfefdd514db314e2f41ac2fd
font_01_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 9876 bytes
SHA-256: e14f39c23eb102c04238de7774d2d3231e9673063a7a3160137caf617c8c3bda
font_02_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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